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共用题干 第二篇Bone Marrow TransplantationBone marrow is the spongy tissue inside some of your bones,such as your hip and thigh bones. It contains immature cells,called stem cells.The stem cells can develop into the red blood cells that carry oxygen through your

题目
共用题干
第二篇

Bone Marrow Transplantation

Bone marrow is the spongy tissue inside some of your bones,such as your hip and thigh bones. It contains immature cells,called stem cells.The stem cells can develop into the red blood cells that carry oxygen through your body,the white blood cells that fight infections,and the platelets that help with blood clotting.
If there is a problem with your bone marrow,a transplant can give you healthy new marrow. You could need a transplant because of a disease,such as bone marrow diseases or cancers like leukemia kemia or lymphoma.Or you might need one if a strong cancer treatment kills your healthy blood cells.
People with cancer sometimes donate bone marrow before treatment to be transplanted later. But often the new marrow comes from a donor,either a close family member or someone unrelated.
The healthy cells for a transplant can come from three sources:bone marrow;peripheral (circulating) blood that has an increased number of healthy blood-forming cells(also called peripheral blood stem cells or PBSC);umbilical cord blood that is collected after a baby is born.
If you need an allogeneic transplant,your doctor will look for a marrow donor or cord blood unit that matches your HLA tissue type.HLA stands for human leukocyte antigen,a markei your immune system uses to recognize which cells belong in your body and which do not.
Before your body can receive the healthy cells,the diseased cells must be destroyed.This is done using chemotherapy and sometimes radiation. The destruction of diseased cells is called a preparative regimen or a conditioning regimen.
On the day of transplant,the cells from the marrow donor or cord blood unit are infused intravenously(go into your body through a large vein).These healthy cells move into the spaces inside your bones where they create new marrow. They grow and make healthy new red blood cells,white blood cells,and platelets.

Healthy stem cells may come from the following sources EXCEPT__________.
A:peripheral blood stem cells
B:baby blood
C:bone marrow
D:cord blood
参考答案和解析
答案：B
解析：
细节题。第三段最后一句：通常新骨髓来源于一个捐献者，或者是血缘亲近的家人，或者是无血缘关系的陌生人。B不全面，C“器官捐献者”，也不正确。
词义推断题。第一段第二句：它包括不成熟的细胞，被称作干细胞。A是 “主要的”,B是“杰出的”,D是“重要的”，只有C是“发育不完全的”。
细节题。由第四段可以看出，A、C、D都是文章提到的，只有B"婴儿的血液”除外。
细节题。倒数第二段提到了生病的细胞一定要被破坏掉，A和B都是破坏的方式，都不全面。C意思不明，且与文义不符。D的意思是被彻底破坏掉。
推断题。A选项文章没有提及。C选项语气过于绝对，文章中没有如此说明。第三段第一句说癌症患者有时会在治疗前捐出骨髓用于日后的移植，D选项说必须，则是不正确的。从文章中可以看出，骨髓移植是很复杂的，因此B选项是可以推断出来的。
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相似问题和答案

第1题：

共用题干
Tiny Invaders

The human body is truly amazing. It allows us to sense the world around us,to do work and have fun,
and to move from place to place.In fact,the human body does its work so well that most people don't think
about it very much-until they get sick.
The germs（致病菌）that make people sick are everywhere. You can ' t see them , but they ' re there.
They're sitting on your desk.They're hiding on your computer's keyboard.They're even in the air that you
are breathing. There are two types of germs : viruses and bacteria（细菌）.Viruses are germs that can only
live inside animals or plants. Viruses cause illnesses such as flu and measles（麻疹）.Bacteria are tiny
creatures.Some bacteria are good.They can help your stomach break down food.Other bacteria aren't so
good. They can make you sick. Bacteria can cause sore throats（喉痛）and ear infections.
How can you stop these tiny invaders from making you sick?Your skin is the first defense against
germs.You can prevent some illnesses simply by washing,with soap and water. But germs can still enter the
body through small cuts in the skin or through the mouth,eyes,and nose.
Once germs are inside your body , your immune（免疫的）system tries to protect you. It looks for and
destroys germs.How does it do that?Special cells patrol your body.Some of these cells actually eat germs!
Other cells make antibodies.An antibody sticks to a germ.There is a different antibody for each kind of
germ.Some antibodies keep germs from making you sick.Others help your body find and kill germs.After a
germ is destroyed,the antibodies stay in your body.They protect you if the same kind of germ comes back.
That way you will not get the same illness twice.
You can keep your body healthy by eating a nutritious（有营养的）diet to make your immune systerm
strong. You can also help your immune system fight germs by getting vaccinated（接种）.Vaccines are
medicines.They contain germs that have been killed or weakened.The dead germs can't make you sick.
Instead,they cause your body to make antibodies.If the same germ ever shows up again,then your
antibodies attack it.

Washing your skin can prevent some illnesses.
A:Right
B:Wrong
C:Not mentioned

答案：A
解析：
由文章第二段的第七句“Viruses are germs that can only live inside animals or plants.”可知，病毒只能生存在动植物体内，故选B。
由第二段内容可知，致病菌有两种：一种是细菌；一种是病毒。病毒会致病，但有一部分细菌是良性的，故选B。
由文章第三段第三句“You can prevent some illnesses simply by washing, with soap andwater.”可知，通过用水打上肥皂清洗皮肤可以预防一些疾病，故选A。
由文章第三段最后一句中“germs can still enter the body through...eyes and nose”可知，致病菌可以通过伤口、口、眼、鼻等进入人体，故选A。
文章并未提及心脏含有人体最强健的肌肉，故选C。
由文章第四段倒数第三句“After a germ is destroyed, the antibodies stay in your body.”可 知，在毁掉致病菌以后，抗体会留在人体中，故选A。
由文章最后一段内容可知，疫苗是接种到人体中用以抵抗致病菌的；疫苗是一种药物， 故选B。第3部分：概括大意与完成句子

第2题：

共用题干
Tiny Invaders

The human body is truly amazing. It allows us to sense the world around us,to do work and have fun,
and to move from place to place.In fact,the human body does its work so well that most people don't think
about it very much-until they get sick.
The germs（致病菌）that make people sick are everywhere. You can ' t see them , but they ' re there.
They're sitting on your desk.They're hiding on your computer's keyboard.They're even in the air that you
are breathing. There are two types of germs : viruses and bacteria（细菌）.Viruses are germs that can only
live inside animals or plants. Viruses cause illnesses such as flu and measles（麻疹）.Bacteria are tiny
creatures.Some bacteria are good.They can help your stomach break down food.Other bacteria aren't so
good. They can make you sick. Bacteria can cause sore throats（喉痛）and ear infections.
How can you stop these tiny invaders from making you sick?Your skin is the first defense against
germs.You can prevent some illnesses simply by washing,with soap and water. But germs can still enter the
body through small cuts in the skin or through the mouth,eyes,and nose.
Once germs are inside your body , your immune（免疫的）system tries to protect you. It looks for and
destroys germs.How does it do that?Special cells patrol your body.Some of these cells actually eat germs!
Other cells make antibodies.An antibody sticks to a germ.There is a different antibody for each kind of
germ.Some antibodies keep germs from making you sick.Others help your body find and kill germs.After a
germ is destroyed,the antibodies stay in your body.They protect you if the same kind of germ comes back.
That way you will not get the same illness twice.
You can keep your body healthy by eating a nutritious（有营养的）diet to make your immune systerm
strong. You can also help your immune system fight germs by getting vaccinated（接种）.Vaccines are
medicines.They contain germs that have been killed or weakened.The dead germs can't make you sick.
Instead,they cause your body to make antibodies.If the same germ ever shows up again,then your
antibodies attack it.

Viruses can only live inside people or animals.
A:Right
B:Wrong
C:Not mentioned

答案：B
解析：
由文章第二段的第七句“Viruses are germs that can only live inside animals or plants.”可知，病毒只能生存在动植物体内，故选B。
由第二段内容可知，致病菌有两种：一种是细菌；一种是病毒。病毒会致病，但有一部分细菌是良性的，故选B。
由文章第三段第三句“You can prevent some illnesses simply by washing, with soap andwater.”可知，通过用水打上肥皂清洗皮肤可以预防一些疾病，故选A。
由文章第三段最后一句中“germs can still enter the body through...eyes and nose”可知，致病菌可以通过伤口、口、眼、鼻等进入人体，故选A。
文章并未提及心脏含有人体最强健的肌肉，故选C。
由文章第四段倒数第三句“After a germ is destroyed, the antibodies stay in your body.”可 知，在毁掉致病菌以后，抗体会留在人体中，故选A。
由文章最后一段内容可知，疫苗是接种到人体中用以抵抗致病菌的；疫苗是一种药物， 故选B。第3部分：概括大意与完成句子

第3题：

In medical training standards，seafarers are not required to demonstrate their ability ______．

A.to provide medical first aid on board

B.to take charge of medical care on board ships

C.to take immediate effective action in the case of accidents or illness likely to occur on board ship

D.to improve cardiac function after transplantation of autologous bone marrow mesenchymal stem cells


正确答案：D

第4题：

共用题干
Leukemia

Leukemia is the most common type of cancer kids get,but it is still very rare.Leukemia involves the
blood and blood-forming organs,such as the bone marrow.________(46)
A kid with leukemia produces lots of abnormal white blood cells in the bone marrow. Usually,white
blood cells fight infection,but the white blood cells in a person with leukemia don't work the way they're
supposed to.________(47)The abnormal white blood cells multiply out of control,filling the bone marrow
and making it hard for enough normal,infection-fighting white blood cells to form.Other blood cells一such as
red blood cells(that carry oxygen in the blood to the body's tissues)and platelets(that allow blood to
clot）一are also crowded out by the white blood cells of leukemia. These cancer cells may also move to other
parts of the body,including the bloodstream,where they continue to multiply and build up.
Although leukemia can make kids sick,most of the time it is treatable,and kids get better. Almost all
leukemia patients are treated with chemotherapy,which means using anti-cancer drug.
________(48)Chemotherapy quickly goes to work,traveling through the blood to the bone marrow.
There,the drugs can attack the cancer cells.After several weeks of chemotherapy,many kids begin to feel
better.
Some children with leukemia will also have to have radiation therapy,too.________(49)If the cancer
isn't getting better from using the usual amounts of chemotherapy and radiation,then a kid with leukemia
will probably need more treatment一with higher doses of chemotherapy and radiation to finally kill the cancer
cells.But this heavy-duty treatment will also harm the normal cells in the kid's bone marrow too,and the
bone marrow will no longer be able to produce normal blood cells.So,doctors will then give a kid一or anyone
else with bone marrow that is no longer working一normal bone marrow tissue from someone else who is
healthy.________(50)

___________（50）
A:The chemotherapy drugs are given through a catheter,a narrow tube that is inserted into a blood vessel, sometimes in the kid's upper chest.
B:Early symptoms of leukemia are often overlooked,since they may resemble symptoms of the flu or other common diseases.
C:This is a special procedure called a bone marrow transplant,and it helps the patient make new blood cells so they can recover from the leukemia.
D:Bone marrow is the innermost part of some bones where blood cells are first made.
E:They don't protect the person from infections very well.
F: Radiation therapy uses invisible high-energy waves(similar to X-rays)to kill cancerous cells.

答案：C
解析：
在空前一句“Leukemia involves the blood and blood-forming organs, such as the bone mar- row."，意思是白血病涉及到血液和造血器官，如骨髓。提到了bone marrow，那么下一句就应 与bone marrow有关，只有D项是阐述骨髓的句子，故D为正确答案。
此空前一句讲，通常情况下，白细胞会对抗感染，但是白血病病人身上的白细胞却发挥 不了其应当发挥的作用。这意味着它们不能很好地保护病人免受感染的侵袭，故E为正确 答案。
此空前一段涉及化学疗法，即抗癌药物的使用。接下来应首选表达如何使用化疗药物 的句子，故A为正确答案。
此空前一句讲到，有些患白血病的孩子也将接受放射治疗。接下来应选择有关放射治 疗的句子，故F为正确答案。
此段的主要意思是，接受大剂量化疗的白血病患者的骨髓可能会出现问题，不能再正 常地发挥作用。这时，医生就要把一个正常人的骨髓组织移植到他身上。这一医疗措施的名 称及其作用应该是下一句话所表达的内容，故C为正确答案。

第5题：

共用题干
Tiny Invaders

The human body is truly amazing. It allows us to sense the world around us,to do work and have fun,
and to move from place to place.In fact,the human body does its work so well that most people don't think
about it very much-until they get sick.
The germs（致病菌）that make people sick are everywhere. You can ' t see them , but they ' re there.
They're sitting on your desk.They're hiding on your computer's keyboard.They're even in the air that you
are breathing. There are two types of germs : viruses and bacteria（细菌）.Viruses are germs that can only
live inside animals or plants. Viruses cause illnesses such as flu and measles（麻疹）.Bacteria are tiny
creatures.Some bacteria are good.They can help your stomach break down food.Other bacteria aren't so
good. They can make you sick. Bacteria can cause sore throats（喉痛）and ear infections.
How can you stop these tiny invaders from making you sick?Your skin is the first defense against
germs.You can prevent some illnesses simply by washing,with soap and water. But germs can still enter the
body through small cuts in the skin or through the mouth,eyes,and nose.
Once germs are inside your body , your immune（免疫的）system tries to protect you. It looks for and
destroys germs.How does it do that?Special cells patrol your body.Some of these cells actually eat germs!
Other cells make antibodies.An antibody sticks to a germ.There is a different antibody for each kind of
germ.Some antibodies keep germs from making you sick.Others help your body find and kill germs.After a
germ is destroyed,the antibodies stay in your body.They protect you if the same kind of germ comes back.
That way you will not get the same illness twice.
You can keep your body healthy by eating a nutritious（有营养的）diet to make your immune systerm
strong. You can also help your immune system fight germs by getting vaccinated（接种）.Vaccines are
medicines.They contain germs that have been killed or weakened.The dead germs can't make you sick.
Instead,they cause your body to make antibodies.If the same germ ever shows up again,then your
antibodies attack it.

Germs can enter the body through the eyes.
A:Right
B:Wrong
C:Not mentioned

答案：A
解析：
由文章第二段的第七句“Viruses are germs that can only live inside animals or plants.”可知，病毒只能生存在动植物体内，故选B。
由第二段内容可知，致病菌有两种：一种是细菌；一种是病毒。病毒会致病，但有一部分细菌是良性的，故选B。
由文章第三段第三句“You can prevent some illnesses simply by washing, with soap andwater.”可知，通过用水打上肥皂清洗皮肤可以预防一些疾病，故选A。
由文章第三段最后一句中“germs can still enter the body through...eyes and nose”可知，致病菌可以通过伤口、口、眼、鼻等进入人体，故选A。
文章并未提及心脏含有人体最强健的肌肉，故选C。
由文章第四段倒数第三句“After a germ is destroyed, the antibodies stay in your body.”可 知，在毁掉致病菌以后，抗体会留在人体中，故选A。
由文章最后一段内容可知，疫苗是接种到人体中用以抵抗致病菌的；疫苗是一种药物， 故选B。第3部分：概括大意与完成句子

第6题：

共用题干
Tiny Invaders

The human body is truly amazing. It allows us to sense the world around us,to do work and have fun,
and to move from place to place.In fact,the human body does its work so well that most people don't think
about it very much-until they get sick.
The germs（致病菌）that make people sick are everywhere. You can ' t see them , but they ' re there.
They're sitting on your desk.They're hiding on your computer's keyboard.They're even in the air that you
are breathing. There are two types of germs : viruses and bacteria（细菌）.Viruses are germs that can only
live inside animals or plants. Viruses cause illnesses such as flu and measles（麻疹）.Bacteria are tiny
creatures.Some bacteria are good.They can help your stomach break down food.Other bacteria aren't so
good. They can make you sick. Bacteria can cause sore throats（喉痛）and ear infections.
How can you stop these tiny invaders from making you sick?Your skin is the first defense against
germs.You can prevent some illnesses simply by washing,with soap and water. But germs can still enter the
body through small cuts in the skin or through the mouth,eyes,and nose.
Once germs are inside your body , your immune（免疫的）system tries to protect you. It looks for and
destroys germs.How does it do that?Special cells patrol your body.Some of these cells actually eat germs!
Other cells make antibodies.An antibody sticks to a germ.There is a different antibody for each kind of
germ.Some antibodies keep germs from making you sick.Others help your body find and kill germs.After a
germ is destroyed,the antibodies stay in your body.They protect you if the same kind of germ comes back.
That way you will not get the same illness twice.
You can keep your body healthy by eating a nutritious（有营养的）diet to make your immune systerm
strong. You can also help your immune system fight germs by getting vaccinated（接种）.Vaccines are
medicines.They contain germs that have been killed or weakened.The dead germs can't make you sick.
Instead,they cause your body to make antibodies.If the same germ ever shows up again,then your
antibodies attack it.

Vaccines can make you sick.
A:Right
B:Wrong
C:Not mentioned

答案：B
解析：
由文章第二段的第七句“Viruses are germs that can only live inside animals or plants.”可知，病毒只能生存在动植物体内，故选B。
由第二段内容可知，致病菌有两种：一种是细菌；一种是病毒。病毒会致病，但有一部分细菌是良性的，故选B。
由文章第三段第三句“You can prevent some illnesses simply by washing, with soap andwater.”可知，通过用水打上肥皂清洗皮肤可以预防一些疾病，故选A。
由文章第三段最后一句中“germs can still enter the body through...eyes and nose”可知，致病菌可以通过伤口、口、眼、鼻等进入人体，故选A。
文章并未提及心脏含有人体最强健的肌肉，故选C。
由文章第四段倒数第三句“After a germ is destroyed, the antibodies stay in your body.”可 知，在毁掉致病菌以后，抗体会留在人体中，故选A。
由文章最后一段内容可知，疫苗是接种到人体中用以抵抗致病菌的；疫苗是一种药物， 故选B。第3部分：概括大意与完成句子

第7题：

共用题干
Tiny Invaders

The human body is truly amazing. It allows us to sense the world around us,to do work and have fun,
and to move from place to place.In fact,the human body does its work so well that most people don't think
about it very much-until they get sick.
The germs（致病菌）that make people sick are everywhere. You can ' t see them , but they ' re there.
They're sitting on your desk.They're hiding on your computer's keyboard.They're even in the air that you
are breathing. There are two types of germs : viruses and bacteria（细菌）.Viruses are germs that can only
live inside animals or plants. Viruses cause illnesses such as flu and measles（麻疹）.Bacteria are tiny
creatures.Some bacteria are good.They can help your stomach break down food.Other bacteria aren't so
good. They can make you sick. Bacteria can cause sore throats（喉痛）and ear infections.
How can you stop these tiny invaders from making you sick?Your skin is the first defense against
germs.You can prevent some illnesses simply by washing,with soap and water. But germs can still enter the
body through small cuts in the skin or through the mouth,eyes,and nose.
Once germs are inside your body , your immune（免疫的）system tries to protect you. It looks for and
destroys germs.How does it do that?Special cells patrol your body.Some of these cells actually eat germs!
Other cells make antibodies.An antibody sticks to a germ.There is a different antibody for each kind of
germ.Some antibodies keep germs from making you sick.Others help your body find and kill germs.After a
germ is destroyed,the antibodies stay in your body.They protect you if the same kind of germ comes back.
That way you will not get the same illness twice.
You can keep your body healthy by eating a nutritious（有营养的）diet to make your immune systerm
strong. You can also help your immune system fight germs by getting vaccinated（接种）.Vaccines are
medicines.They contain germs that have been killed or weakened.The dead germs can't make you sick.
Instead,they cause your body to make antibodies.If the same germ ever shows up again,then your
antibodies attack it.

All bacteria cause illnesses.
A:Right
B:Wrong
C:Not mentioned

答案：B
解析：
由文章第二段的第七句“Viruses are germs that can only live inside animals or plants.”可知，病毒只能生存在动植物体内，故选B。
由第二段内容可知，致病菌有两种：一种是细菌；一种是病毒。病毒会致病，但有一部分细菌是良性的，故选B。
由文章第三段第三句“You can prevent some illnesses simply by washing, with soap andwater.”可知，通过用水打上肥皂清洗皮肤可以预防一些疾病，故选A。
由文章第三段最后一句中“germs can still enter the body through...eyes and nose”可知，致病菌可以通过伤口、口、眼、鼻等进入人体，故选A。
文章并未提及心脏含有人体最强健的肌肉，故选C。
由文章第四段倒数第三句“After a germ is destroyed, the antibodies stay in your body.”可 知，在毁掉致病菌以后，抗体会留在人体中，故选A。
由文章最后一段内容可知，疫苗是接种到人体中用以抵抗致病菌的；疫苗是一种药物， 故选B。第3部分：概括大意与完成句子

第8题：

共用题干
Tiny Invaders

The human body is truly amazing. It allows us to sense the world around us,to do work and have fun,
and to move from place to place.In fact,the human body does its work so well that most people don't think
about it very much-until they get sick.
The germs（致病菌）that make people sick are everywhere. You can ' t see them , but they ' re there.
They're sitting on your desk.They're hiding on your computer's keyboard.They're even in the air that you
are breathing. There are two types of germs : viruses and bacteria（细菌）.Viruses are germs that can only
live inside animals or plants. Viruses cause illnesses such as flu and measles（麻疹）.Bacteria are tiny
creatures.Some bacteria are good.They can help your stomach break down food.Other bacteria aren't so
good. They can make you sick. Bacteria can cause sore throats（喉痛）and ear infections.
How can you stop these tiny invaders from making you sick?Your skin is the first defense against
germs.You can prevent some illnesses simply by washing,with soap and water. But germs can still enter the
body through small cuts in the skin or through the mouth,eyes,and nose.
Once germs are inside your body , your immune（免疫的）system tries to protect you. It looks for and
destroys germs.How does it do that?Special cells patrol your body.Some of these cells actually eat germs!
Other cells make antibodies.An antibody sticks to a germ.There is a different antibody for each kind of
germ.Some antibodies keep germs from making you sick.Others help your body find and kill germs.After a
germ is destroyed,the antibodies stay in your body.They protect you if the same kind of germ comes back.
That way you will not get the same illness twice.
You can keep your body healthy by eating a nutritious（有营养的）diet to make your immune systerm
strong. You can also help your immune system fight germs by getting vaccinated（接种）.Vaccines are
medicines.They contain germs that have been killed or weakened.The dead germs can't make you sick.
Instead,they cause your body to make antibodies.If the same germ ever shows up again,then your
antibodies attack it.

The heart contains the body's strongest muscle.
A:Right
B:Wrong
C:Not mentioned

答案：C
解析：
由文章第二段的第七句“Viruses are germs that can only live inside animals or plants.”可知，病毒只能生存在动植物体内，故选B。
由第二段内容可知，致病菌有两种：一种是细菌；一种是病毒。病毒会致病，但有一部分细菌是良性的，故选B。
由文章第三段第三句“You can prevent some illnesses simply by washing, with soap andwater.”可知，通过用水打上肥皂清洗皮肤可以预防一些疾病，故选A。
由文章第三段最后一句中“germs can still enter the body through...eyes and nose”可知，致病菌可以通过伤口、口、眼、鼻等进入人体，故选A。
文章并未提及心脏含有人体最强健的肌肉，故选C。
由文章第四段倒数第三句“After a germ is destroyed, the antibodies stay in your body.”可 知，在毁掉致病菌以后，抗体会留在人体中，故选A。
由文章最后一段内容可知，疫苗是接种到人体中用以抵抗致病菌的；疫苗是一种药物， 故选B。第3部分：概括大意与完成句子

第9题：

根据下面资料，回答
Germs are everywhere. You can′t see them, but they are on your desk, on your computer, and even in the air!
Like people, germs move around the world. They fly with us on planes. When food, clothes, and other things travel around the world, germs travel, too. Some germs are safe, but some are dangerous. Germs cause illnesses like colds and the flu.
Warmer Weather Brings Germs
The world′s weather is changing. Cooler countries are getting warmer, so insects from hot countries can move there. Some of these insects, like mosquitoes, carry dangerous germs. These germs cause headaches, fever, and can even kill people.
Under Your Skin
Your skin protects you from germs. It stops some germs, but not all. They can enter your body when you eat, or when you have a cut. Germs are on your hands, too. They enter your body when you touch your eyes, nose, or mouth.
Your immune system (免疫系统) protects you, too. When germs get inside your body, your immune system finds and kills them. Special cells (细胞) move around your body and fight germs. They help you stay healthy. Other cells make antibodies. Antibodies help your body find and stop germs.
What can you do to fight germs? You should wash your hands with soap and water. Soap kills many germs, and water washes them away.
What do antibodies do?
_______________________________________________________________________


答案：
解析：
They help protect us from germs．

第10题：

共用题干
Stem Cell Therapy May Help Repair the Heart
According to scientists in the USA,stem cell therapy may one day be able to repair the
hearts of people with heart failure.Researchers at Pittsburgh University School of Medicine
examined 20 patients who had severe heart failure and were going to have surgery.
They injected stem cells into the parts of their hearts that were damaged.They then
compared their hearts with those of people who had undergone surgery without having the
stem cells injected into them(they had also suffered from severe heart failure).The
patients who had had the stem cells injected had hearts that were able to pump（用泵抽运）
more blood than the others.
According to Professor Robert Kormos,one of the researchers,these results could
revolutionize heart treatment.Although previous studies had indicated that there might be a
benefit,this is the first study that has actually proved that stem cell therapy can help the
failing heart work better．
All the patients in this study had hearts that could not pump blood properly.The
scientists measured their ejection fraction（射血分数）.This is a measure of heart
performance;you measure how much blood is being pumped out by the left ventricle（心
室）.
Healthy people's ejection fraction is about 55%.These patients had ejection fraction of
under 35%. They all had by-pass surgery（搭桥手术）performed on them. Some of the
patients had stem cells taken from their hip bones and injected into 25-30 sites in the
damaged heart muscle.Six months later their ejection fraction rate was 46.1%while those
who just had surgery but no stem cell injections averaged 37. 2%.
No side effects were reported.
Heart failure is a common problem all over the world.In the UK alone about 650, 000
people suffer from heart failure every year. As the number of people suffering from heart
failure increases in the world in general these findings are particularly significant.
Current treatments relieve the symptoms.This new stem cell therapy actually repairs
the damaged muscle in the heart and has the potential of curing the disease.

Heart failure is more common in the UK than anywhere else in the world.
A:Right
B:Wrong
C:Not mentioned

答案：C
解析：

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