英语三级考试重点词汇辅导

"Well ,we're in our new house． Let's get a new pet to go along with it．Mrs Brown said to her husband．

"That sounds like a pretty good idea ,"he answered． "Do you want to see the ads in the newspaper?"

" Let-s go to the animal shelter． Many pets there need homes． Since tomorrow is Saturday, we can both go ,"she said．

The next morning the Browns met MrS now at the animal shelter． "We want to be sure that the pets here go to good homes ,"Mr Snow said ,"so I need to ask you some questions． " After they talked for a while ,the Browns decided to get a small dog． It wouldn't need-a big

house or a big yard; A small dog would bark(吠) and warn them if someone tried to break into their house． After Mr Snow gave the Browns a book on pet care ,they chose one and wanted to take her home right away． But the animal doctor hadn't checked her yet． So Mrs now told them to return on Sunday．

On Sunday afternoon the Browns went to the animal shelter． The animal doctor said, "Shadow has had all of her shots(预防针)． She will be healthy． "The Browns thanked the doc- tor and took Shadow home．

( )26． From the reading we learn that_________ ．

A． the Browns have never had a pet before

B． the Browns knew about Shadow from the newspaper

C． Shadow is a small and healthy dog

D． Mr Brown didn-t quite agree with his wife

正确答案：C
26.C【解析】从文中可知Brown夫妇是在动物收容所见到了Shadow，结合短文可知C为正确选项。

What does the phrase “the wake-up call” in Paragraph 3 most probably mean?

A. a new disease B. a clear warning

C. a dangerous animal D. a morning call

正确答案：B

4．— Did you have anyone ______the trees?

—Yes，l had the trees ______．

A． to water ;water

B． to water; watered

C． water ; to be watered

D． water; watered

正确答案：D
4.D【解析】此题考查have的用法．have sb. do意为“让某人做……”；have sth. done意为“让某事被做”。故答案为D。

Most animals have little connection with animals of different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership ( 伙伴关系 ) which does good to both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (寄生虫 ) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.

Sometimes an animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals ( 珊瑚 ) of the sea. In their skins they have tiny plants act as "dustman", taking some of the waste products form. the corals and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are ever prevented from lighting so that they cannot live normally, the corals will die.

1、Some birds like to sit on a sheep because ( ).

A、they can eat its parasites

B、 they depend on the sheep for existence

C、 they enjoy traveling with the sheep

D、 they find the position most comfortable

2、The underlined word "they" in the last sentence of the first paragraph refers to ( ).

A、birds and parasites

B、birds and sheep

C、parasites and sheep

D、sheep, birds and parasites

3、What does the second paragraph mainly discuss? ( )

A、Some animals and plants depend on each other for existence.

B、 Some animals and plants develop their relationship easily.

C、 Some plants depend on each other for foo

D、 Some animals live better together.

4、What does this article talk about? ( )

A、Two kinds of animals for a partnership.

B、Most animals only have connection with animals.

C、The connection between the living things.

D、Corals have some connection with plants.

正确答案：1A 2B 3A 4C

You would laugh if anyone ____ ask you whether you can tell an animal from a plant.

A: will

B: shall

C: should

D: would

参考答案：C

2011年英语三级考试重点词汇辅导1. ceremony（n.）仪式，典礼The awards ceremony was packed with rich and famous people.颁奖典礼中挤满了有钱及知名人士。2. organism（n.）生物，有机体Any living thing is an organism.任何有生命的东西都是有机体。3. nest egg储蓄By retirement， they had saved up quite a nest egg.到退休时，他们已经存了一大笔钱了。4. plant（n.）植物Most plants need dirt， water and sunlight to live.大部分的植物需要仰赖土壤，水和阳光生存。5. animal（n.）动物What is the biggest animal you have seen？您所看过最大的动物是什么？6. college fund念大学的基金Ive been adding to his college fund for years now.。我已经为他的大学基金贡献多年了。7. living（a.）有生命的;活的Coral is actually a living animal， living on top of dead animals.珊瑚事实上是一种有生命的动物，生长在死去动物身上。8. mammal（n.）哺乳动物Did you know that whales are mammals？您知道鲸鱼是哺乳动物吗？9. nuclear family核心家庭My cousin is not part of my nuclear family.我的堂表兄弟姊妹并不是核心家庭的一部分。10. insect（n.）昆虫考试就上考试大Mosquitoes are my least favorite insect.蚊子是我最不喜欢的昆虫。11. fowl（n.）鸟禽类Ducks are a type of water fowl.鸭子是一种水上禽鸟。12. seeing each other约会Weve been seeing each other for about 3 months.我们已经约会大约三个月了。13. complimentary（a.）【美】赠送的The flight attendant gave me a complimentary drink after we took off.飞机起飞后，服务人员给我们附赠的饮料。14. currency（n.）货币Every country has its own currency.每个国家都有自己的货币。15. behave yourself规矩点Please behave yourself before the guests.在宾客面前请你检点一些。16. reusable（a.）可重复使用的Reusable items last longer than disposable ones and help the environment.可重复使用的物品比抛弃式耐用，而且对环境比较好。17. impact（n.）影响Tourists can have a big impact on the places they visit.观光客对他们所参观的地方可造成很大的影响。18. behind the scenes幕后He is the man behind the scenes.他是幕后人物。19. contraband（n.）违禁品If you bring contraband into a country， you may go to jail.如果你把违禁品带进一个国家，可能要坐牢。20. quarantine（n.）隔离If you bring your pet to another country， you may have to put it in quarantine for a while.如果你把宠物带到另一个国家，它可能要被隔离一段时间。21. between ourselves私下的话，不可外传This matter is between ourselves.这事你我知道就好。22. provision（n.）储备粮食We brought plenty of provisions for the trip.我们为这趟旅行带了足够的粮食。23. cuisine（n.）美食;佳肴French cuisine is famous around the world.法国美食举世闻名。24. beyond the seas在国外，在海外He had a good time when he was beyond the seas.他在国外时曾过得很快活25. chow（n.）【口】食物，食品We had some good chow in that little restaurant.我们在那家小曙U吃了一些不错的食物。26. delicacy（n.）美食;佳肴This is a local delicacy and you cant find it anywhere else.这是当地的美食，而且您无法在其它地方找到它。27. butt in插手;介入;插嘴Dont butt in！不要管闲事！28. raw（a.）生的，未煮过的In Italy， they serve raw beef.在意大利，他们提供生牛肉。29. grill（n.）烤架;烧烤的肉类食物This steak is fresh off the grill！这块新鲜的牛排是刚烧烤好的！30. by and large大体上，总的看来I cannot totally take your point， but by and large I think yours is reasonable.我不能完全同意你的观点，但大体上你的观点是有道理的。31. boil（vt.）烹煮Dumplings are often eaten boiled.水饺经常被烹煮来吃。32 。 stew（vt.）（用文火）煮，炖，焖Can you stew up some meat and vegetables？您能炖煮一些肉和蔬菜吗？33. cal、l the shots做决断Who do you think you are calling the shots？在这指发号施令，你以为你是谁啊？34. steam（vt.）蒸，煮She prefers to steam her dumplings.她比较喜欢蒸的水饺。35. aromatic（a.）芳香的考试就上考试大Fresh bread is quite aromatic.新鲜的面包很香。36. steam（vt.）蒸，煮She prefers to steam her dumplings.她比较喜欢蒸的水饺。37. aromatic（a.）芳香的Fresh bread is q、uite aromatic.新鲜的面包很香。38. clown around胡闹That boy is seldom serious about anything. Hes always clowning around.这个男孩对任何事情都不认真，他总是胡闹。39. flaky（n.）薄片的;成层状的The croissants were fresh and flaky.牛角面包很新鲜又薄而易剥。40. rich（a.）味道浓厚That chocolate cake is too rich for me.那个巧克力蛋糕对我来说太浓了。41. cook up构思;策划I have to co

From what you _____, you can understand why an object weighs less in water than in air.

A、had learnt

B、will learn

C、have learnt

D、can learn

参考答案：C

What’s the best title of this passage?__________ .

A. A pig and a cow B. A farm C. The most important animal

正确答案：C

Tracking Down HIV

　　In the summer of 1980, a patient had a strange purplish spot removedfrom below his ear. It was Kaposi’s sarcoma, a rarefm of skin cancer. This patient also had lymph node swelling exhaustion.In November 1980, a Los Angeles immunologist examined a young man who haddiseases linked to immune system malfunctions. The doct had a T-cell counttaken of the patient’s blood. T-cells are a type of white blood cell that playsa key role1 in immune responses. The patient had no helper T-cells.

　　By the end of 1980, 55 Americans were diagnosed with infectionsrelated to immune system breakdown; four had died. A year later the death tollwas 74. Intravenous drug users had T-cell abnmalities. People who hadreceived blood transfusions showed symptoms of immune system breakdown. By July1982, 471 cases of the disease, now called Acquired Immune Deficiency Syndrome(AIDS), had been repted; 184 people had died.

　　In April 1984, American virologist Dr. Robert Gallo isolated thepathogen, disease producer, responsible f2 AIDS. He called it HTLV-III. InParis, Dr. Luc Montagnier identified a virus he called LAV. An internationalpanel of scientists determined that both men had found the same virus. Itbecame known as Human Immunodeficiency virus (HIV). Blood banks began screeningf HTV in 1985, but by then about 29,000 people had been infected throughblood transfusions. Some 12,000 hemophiliacs had contracted HIV throughblood-clotting products. By 1995, 477,900 Americans had AIDS; 295,500 had died.

　　In 1996, researchers announced drugs that reduced HIV in infectedpeople. Today scientists are testing vaccines believe that if HIV can besuppressed, then perhaps it can be eradicated3, but it is still a race againsttime.

　　词汇：

　　spot n. 地点，斑点，斑块，青春痘

　　lymph n. 淋巴结

　　sarcoma n. 肿瘤，肉瘤，恶性毒瘤

　　exhaustion n. 衰竭，耗尽，精疲力竭

　　immunologist n. 免疫学家

　　malfunction n. 故障，失灵，疾病

　　count n. 计数，计算

　　infection n. 传染病，感染

　　breakdown n. 故障，衰弱，崩溃

　　toll n. 代价，死亡人数

　　intravenous drug n. 静脉注射药物

　　abnmalities n. (abnmality的复数形式)畸形，异常情况

　　blood transfusion n. 输血

　　symptom n. 症状

　　virologist n. 病毒学家

　　virus n. 病毒

　　panel n. 座谈小组，仪表板

　　hemophiliac n. 血友病患者

　　vaccine n. 疫苗

　　注释：

　　1.play a key role...扮演一个关键角色，有至关重要的作用

　　2.be responsible f...对……负责，是……的原因

　　3.can be eradicated可以被根除的

　　练习：
3.The final paragraph leads the reader to see that scientists ____.

　　A　have no hope in ever finding a cure fHIV

　　B　have hope that a cure f HIV will befound

　　C　have run out of time to find a cure fHIV

　　D　are in a contest against each other tofind a cure f HIV

答案：B

解析：

3.B　文章最后一段的最后一句话提到了解题线索，即现在科学家正在测试预防艾滋病的疫苗，他们相信，如果该病毒能被抑制，就可能被根治。

An Essential Scientific Process

All life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.

The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.

Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.

If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet.

　　词汇：

nutrient n.营养物

ganism n.生物体，有机体

carbon dioxide n.二氧化碳

chloplast n.叶绿体

molecule n.分子

vap n.水蒸气

oxygen n.氧气

photosynthesis n.光合作用

chlophyll n.叶绿素

glucose n.葡萄糖

cease v.停止

　　注释：

1.Then animals feed upon the plants.动物以植物为食。

　　练习：

5.Another good title f this passage would be

A.Oxygen Carbon Dioxide.

B.Plants Their Roots.

C.How Photosynthesis Wks.

D.Why Our Earth Needs Water.

答案：C

解析：

5.C　文章的主题是光合作用的基本原理，因此选项C。A、B项在文中有提及，但不是主旨，D项与本文无关

An Essential Scientific Process

All life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.

The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.

Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.

If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet.

　　词汇：

nutrient n.营养物

ganism n.生物体，有机体

carbon dioxide n.二氧化碳

chloplast n.叶绿体

molecule n.分子

vap n.水蒸气

oxygen n.氧气

photosynthesis n.光合作用

chlophyll n.叶绿素

glucose n.葡萄糖

cease v.停止

　　注释：

1.Then animals feed upon the plants.动物以植物为食。

　　练习：

4.This passage is primarily developed by

A.explaining a process.

B.telling a sty.

C.comparing contrasting.

D.convincing the reader of plants’ imptance.

答案：A

解析：

4.A　文章先是介绍了进行光合作用所需的原料和组织，又介绍了光合作用的过程，因此整个逻辑应该是解释过程，而不是讲故事或比较对比。D项是“向读者说明植物的重要性”，这确实是文章的一个目的，但不是文章的组织方式。

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考题单选题植物大部分能量的最终来源是什么？（）A 水B 土壤C 空气D 阳光正确答案：D解析：暂无解析

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考题问答题Practice 2　　Transgenic plants and animals result from genetic engineering experiments in which genetic material is moved from one organism to another, so that the latter will exhibit a characteristic. Business corporations, scientists, and farmers hope that transgenic techniques will allow more cost-effective and precise plants and animals with desirable characteristics that are not available using up to date breeding technology.　　Transgenic techniques allow genetic material to be transferred between completely unrelated organisms.　　In order for a transgenic technique to work, the genetic engineer must first construct a transgene, which is the gene to be introduced plus a control sequence. When making a transgene, scientists usually substitute the original promoter sequence with one that will be active in the correct tissues of the recipient plant or animal.　　The creation of transgenic animals is one of the most dramatic advances derived from recombinant DNA technology. A transgenic animal results from insertion of a foreign gene into an embryo. The foreign gene becomes a permanent part of the host animals’ genetic material. As the embryo develops, the foreign gene may be present in many cells of the body, including the germ cells of the testis or the ovary. If the transgenic animal is fertile, the inserted foreign gene (transgene) will be inherited by future progeny. Thus, a transgenic animal, once created, can persist into future generations. Transgenic animals are different from animals in which foreign cells or foreign organs have been engrafted. The progeny of engrafted animals do not inherit the experimental change. The progeny of transgenic animals do.　　The techniques for creating a transgenic animal include the following: 1) picking a foreign gene, 2) placing the foreign gene in a suitable form called a “construct” which guides the insertion of the foreign gene into the animal genome and encourages its expression, and 3) injecting the construct into a single fertilized egg or at the very early embryo stage of the host animal. Much genetic engineering goes into the choice of a foreign gene and building a construct. The construct must have promoters to turn on foreign gene expression at its new site within the host animal genome. By choosing a particular promoter and splicing it in front of the foreign gene, we can encourage expression of our transgene within a specific tissue.　　One of the most important applications of transgenic animals is the development of new animal models of human disease. Transgenic animals can serve as models for many malignant tumors. Mice have been the most frequent hosts for transgenic modification, other domestic animals have also been used. One idea has been to create transgenic cows which secrete important pharmaceutical substances in their milk. Other attempts are being made to express human interferon in the milk of sheep.　　A transgenic crop plant contains a gene or genes which have been artificially inserted instead of the plant acquiring them through pollination. The inserted gene sequence (known as the transgene) may come from another unrelated plant, or from a completely different species: transgenic BT corn, for example, which produces its own insecticide, containing a gene from a bacterium. Plants containing transgenes are often called genetically modified or GM crops although in reality all crops have been genetically modified from their original wild state by domestication, selection and controlled breeding over long periods of time.正确答案：参考译文转基因动植物系遗传工程实验的产物,在这个实验中,一个生物体的遗传物质被移入另一个生物体内,因而后者就能显示出新的特征。商界、科学家和农民都希望转基因技术能够培育出更具价格优势、而且是最近的培育技术无法培育的恰遂人愿的动植物。转基因技术能使遗传物质在两种完全不相干的生物体之间进行转移。为了启用转基因技术,基因工程师必须首先培育一个转基因,转基因即含有受控序列的用于移植的基因。在培育转基因时,科学家通常用一个将在受体动物或植物的恰当组织中活动的启动子序列替代原有的启动子序列。转基因动物的问世是重组DNA技术最激动人心的进展之一。把异体基因植入胚胎后即培育出转基因动物。这样异体基因就永远地成了宿主动物基因物质的一部分。随着胚胎的发育,异体基因有可能进入身体的许多细胞中,包括睾丸或卵巢的生殖细胞。如果转基因动物具有繁殖能力,植入的异体基因(转基因)就会遗传给下一代。因此,转基因动物一经培育成功,就能世代相传。转基因动物与植入异体细胞或异体器官的动物不一样。植入异体细胞或异体器官的动物发生的实验性变异不会遗传给下一代,而转基因动物的后代会继承转基因引起的变异。转基因动物的培育主要采用以下的技术手段:1)选取一个异体基因,2)把异体基因置于某个合适的“结构体”(译者注:专业术语称plasmid,汉译“质粒”)中,这个结构体能把异体基因导入动物的基因组并能激活基因显现,3)把结构体注入宿主动物的一个单独的受精卵内或宿主动物的发育刚起步的胚胎中。基因工程的重头戏在于选择异体基因和培育结构体。这个结构体必须要有启动子,并靠启动子激活异体基因在宿主动物基因组的新部位上的基因显现。通过选择某个特别的启动子并把它粘接在异体基因表面,就能在某个特别的组织内激发转基因显现。转基因动物最为重要的用途之一是开发培育出罹患人类疾病的新型动物。转基因动物可以用来培育罹患多种人类的恶性肿瘤的“模特儿”,老鼠是最常见的用于基因改造的宿主动物,当然还有别的家畜。人们设想培育一种转基因奶牛,能分泌出含有珍贵药物成分的牛奶,此外,人们正在尝试使羊奶中含有人类干扰素。转基因植物内有一个或多个基因由人工导入,而并非通过天然授粉获得。导入的基因序列(即转基因)可能源于另一种与之毫不相干的植物,甚至会来自于完全不同的物种。例如,转基因Bt玉米就含有某种细菌的基因,能自身产生杀虫物质。体内含有转基因的植物常常称为遗传修饰过的作物,或GM作物,尽管事实上所有的农作物都是由最初的野生状态经过漫长岁月的驯化、优选和调控性育种使其基因得以改良。解析：暂无解析

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考题没有土壤，不足以让陆地植物持续生长没有了植物，动物也能正常生存。（）正确答案:错误

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考题 An Essential Scientific ProcessAll life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet.词汇：nutrient n.营养物 ganism n.生物体，有机体carbon dioxide n.二氧化碳chloplast n.叶绿体molecule n.分子vap n.水蒸气oxygen n.氧气 photosynthesis n.光合作用chlophyll n.叶绿素glucose n.葡萄糖cease v.停止注释：1.Then animals feed upon the plants.动物以植物为食。练习：1.In the first paragraph，the wd “excess” meansA.heavy.B.extra.C.green.D.liquid.答案：B解析：1.B　前文讲到，植物产生的氧气一部分被植物自身消耗了，但植物消耗的氧气量远小于它们产生的氧气，因此可以推测这句话的意思应该是剩余的氧气对于动物以及其他生物体的生存是至关重要的。excess在句中的意思是“超额的”，与extra“额外的”意思相近。

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考题 1. class Animal ｛ Animal getOne（）｛ return new Animal（）；｝｝ 2. class Dog extends Animal ｛ 3. // insert code here 4. ｝ 5. 6. class AnimalTest ｛ 7. public static void main（String [] args）｛ 8. Animal [] animal ＝｛ new Animal（）， new Dog（）｝； 9. for（ Animal a ： animal）｛ 10. Animal x ＝ a.getOne（）； 11. ｝ 12. ｝ 13. ｝和代码： 3a. Dog getOne（）｛ return new Dog（）；｝ 3b. Animal getOne（）｛ return new Dog（）；｝第 3 行中插入的哪项将编译且运行无异常？（） A、3a行B、3b行C、3a行或3b行D、既非3a，也非3b正确答案:D

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考题单选题Which of the following is NOT mentioned as the result of artificial selection by humanity?A Many new kinds of plants and animals are produced.B Financial gain is increased considerably by producing better plants and animals.C Humans are able to control plant and animal reproduction for humans’ pleasure.D It is necessary for humans to maintain the artificial environments.正确答案：C解析：第三段最后一句指出人们对动植物进行人工选择的目的是为了“convenience, pleasure, or financial gain of individuals”，因此A、C项内容符合文意；此外，人们通过对动植物进行人工选择使得它们拥有desirable traits，也就创造出了新品种，故A项也正确；只有D项内容在文中未被提及。

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英语三级考试重点词汇辅导

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