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单选题We find that some birds _____ twice a year between hot and cold countries.A transferB commuteC migrateD emigrate

题目
单选题
We find that some birds _____ twice a year between hot and cold countries.
A

transfer

B

commute

C

migrate

D

emigrate

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相似问题和答案

第1题：

25． We can find ________under Lily's bed．

A．a backpack

B．some flowers

C．a basketball

D．a baseball


正确答案：D

第2题：

With the help of the German experts, the factory produced ( ) cars in 2003 as the year before.

A、twice as many

B、as twice many

C、as twice as many

D、as many as twice


参考答案：A

第3题：

阅读下面短文,根据短文内容,在短文后81－85小题中句子空白处填入适当的词语或句子。We know that m

阅读下面短文，根据短文内容，在短文后８１－８５小题中句子空白处填入适当的词语或句子。

We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another place at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowded.

When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration is probably the migration of fish, which is called “salmon”（鲑鱼）. This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.

Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year, when the season of the bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where the go. So, sometimes we know why humans and animals move from one place to another place, but at other times we don’t. Maybe living things just like to travel.

81. The reason for most of the animals to move is _____________________.


正确答案：
81. to find food more easily 

第4题：

共用题干
Common-cold Sense
You can't beat it,but you don't have to join it.Maybe it got the name"common cold"because it's more common in winter.The fact is,though,being cold doesn't have anything to do with getting one.Colds are caused by the spread of rhinoviruses,and,at least so far,medical science is better at telling you how to avoid getting one than how to get rid of one.
Children are the most common way cold viruses are spread to adults,because they have more colds than adults-an average of about eight per year.Why do kids seem so much more easily to get colds than their parents?Simple.They haven't had the opportunity to become immune to many cold viruses.
There are more than 150 different cold viruses,and you never have the same one twice.being infected by one makes you immune to it-but only it.
Colds are usually spread by direct contact,not sneezing or coughing.From another person's hand to your hand and then to your nose or eyes is the most common route.The highest concentration of cold viruses anywhere is found under the thumbnails of a boy,although the viruses can survive for hours on skin or other smooth surfaces.
Hygiene is your best defense.Wash your hands frequently,preferably with a disinfectant soap,especially when children in your household have colds.
But even careful hygiene won't ward off every cold.So,what works when a coughing,sneezing, runny nose strikes?
The old prescription of two aspirins,lots of water,and bed rest is a good place to start.But you'll also find some of the folk remedies worth trying.Hot mixtures of sugar(or honey),lemon,and water have real benefits.

The best way to keep yourself from getting cold is
A:to keep yourself clean
B:to use a disinfectant soap
C:to take two aspirins every day
D:to drink lots of water

答案：A
解析：
由文章第一段最后一句可知，感冒是由于一种鼻病毒的传播而引起的，故选B。
由文章第五段第一句可知，保持卫生是应对感冒的最好防御，故选A。
由文章第二段最后一句可知，儿童对很多病毒还不具有免疫性，因此他们更易患感冒。故选B。
由文章第三段内容可知，一个人绝不会被同一种感冒病毒感染两次，和C项的表述内容相符，故选C。
由文章倒数第二段第二句的内容可知， 当一个人患感冒时，会出现咳嗽.打喷嚏以及流鼻涕的症状，而未提及有胃疼症状，故选D。

第5题：

We are confident that you will find _____ ready market for the item ______ your end.

A、/; at

B、a; by

C、a; at

D、some; by


正确答案:C

第6题：

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


第7题：

Professor Lee visits China almost ___.

A.twice a year

B.a twice year

C.a year twice

D.a year two times


正确答案：A

第8题：

A

Weather has a great influence(影响) on people．It influences people's health, intelligence (智力) and feelings．

In August, it is very hot and wet in the southern part of the United States．People there have heart disease and other kinds of health problems during this month． In the Northeast and Middle West, it is very hot at some times and very cold at other times．People in these places may have heart disease after the weather changes in February or March．

The weather can also influence intelligence． For example, in a 1982 study by scientists, the in scores of a group of students were very high during a storm, but after the storm their IQ scores were lower than usual level． So storms can increase intelligence．However, very hot weather can lower it． Students in the United States often do badly on exams in the hot months of the year．

Weather also has a strong influence on people's feelings．Winter may be a bad time for thin people．They usually feel cold during these months and they may feel unhappy during cold weather． In hot summer weather, on the other hand, fat people may feel unhappy． The sum- mer heat may make them tired and they are easy to get angry．

( )21．lf thin people feel unhappy, the weather may be very _________．

A．warm

B． cold

C． cool

D． hot


正确答案：B
．21.B【解析】由第四段二、三句可知。

第9题：

共用题干
Common-cold Sense
You can't beat it,but you don't have to join it.Maybe it got the name"common cold"because it's more common in winter.The fact is,though,being cold doesn't have anything to do with getting one.Colds are caused by the spread of rhinoviruses,and,at least so far,medical science is better at telling you how to avoid getting one than how to get rid of one.
Children are the most common way cold viruses are spread to adults,because they have more colds than adults-an average of about eight per year.Why do kids seem so much more easily to get colds than their parents?Simple.They haven't had the opportunity to become immune to many cold viruses.
There are more than 150 different cold viruses,and you never have the same one twice.being infected by one makes you immune to it-but only it.
Colds are usually spread by direct contact,not sneezing or coughing.From another person's hand to your hand and then to your nose or eyes is the most common route.The highest concentration of cold viruses anywhere is found under the thumbnails of a boy,although the viruses can survive for hours on skin or other smooth surfaces.
Hygiene is your best defense.Wash your hands frequently,preferably with a disinfectant soap,especially when children in your household have colds.
But even careful hygiene won't ward off every cold.So,what works when a coughing,sneezing, runny nose strikes?
The old prescription of two aspirins,lots of water,and bed rest is a good place to start.But you'll also find some of the folk remedies worth trying.Hot mixtures of sugar(or honey),lemon,and water have real benefits.

When you are having a cold,______.
A:it is always the same kind of cold that you had last time
B:it may be the same kind of cold that you had last time
C:it is certainly not the same kind of cold that you had last time
D:it is probably not the same kind of cold that you had last time

答案：C
解析：
由文章第一段最后一句可知，感冒是由于一种鼻病毒的传播而引起的，故选B。
由文章第五段第一句可知，保持卫生是应对感冒的最好防御，故选A。
由文章第二段最后一句可知，儿童对很多病毒还不具有免疫性，因此他们更易患感冒。故选B。
由文章第三段内容可知，一个人绝不会被同一种感冒病毒感染两次，和C项的表述内容相符，故选C。
由文章倒数第二段第二句的内容可知， 当一个人患感冒时，会出现咳嗽.打喷嚏以及流鼻涕的症状，而未提及有胃疼症状，故选D。

第10题：

The purpose of mentioning the Weddell Sea is___________.

A.to give an example of cold-water salinity
B.to point out the location of deep waters
C.to make a comparison between hot-water salinity and cold-water salinity
D.to show that the water in the Weddell Sea varies in salinity from place to place

答案：A
解析：
根据“In the Weddell Sea，the densest water in the ocean is formed as a resuit ofthis freez．ing process，which increases the salinity of cold water．”可知，Weddell Sea是作为一个例子，说明this freezing pro—cess引起盐度变化，答案为A。

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