单选题We find that some birds _____ twice a year between hot and cold countries.AtransferBcommuteCmigrateDemigrate
单选题
We find that some birds _____ twice a year between hot and cold countries.
A
transfer
B
commute
C
migrate
D
emigrate
参考解析
解析：
句意：我们发现一些鸟在天暖和天寒的地区之间一年迁徙两次。migrate迁移，迁居，迁徙可指鸟、鱼等的迁徙，与bird和twice a year形成语义关系，符合句意。transfer迁移，转移，传递，调任，但迁移或转移的对象通常作宾语而不是主语。commute通勤，强调有规律地、频繁地来往于两地间。emigrate移居，迁居，指由本地移居他国。
句意：我们发现一些鸟在天暖和天寒的地区之间一年迁徙两次。migrate迁移，迁居，迁徙可指鸟、鱼等的迁徙，与bird和twice a year形成语义关系，符合句意。transfer迁移，转移，传递，调任，但迁移或转移的对象通常作宾语而不是主语。commute通勤，强调有规律地、频繁地来往于两地间。emigrate移居，迁居，指由本地移居他国。
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When did you last see a polar bear?On a trip to a zoo,perhaps?If you had attended a winter activity in New York a few years ago,you would have seen a whole polar bear club.These"Polar Bears"are people who-meet frequently in winter to swim in freezing cold water.That day,the air temperature was 3oC,and the water temperature was a bit higher.The members of the Polar Bear Club at Coney Island,New York are usually about the age of 60.Members must satisfy two requirements.First,they must get along well with everyone else in the group.This is very important because there are so many different kinds of people in the club.Polar Bears must also agree to swim outdoors at least twice a month from November through February.Doctors do not agree about the medical effects of cold-water swimming.Some are worried about the dangers of a condition in which the body′s temperature drops so low that finally the heart stops.Other doctors,however,point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.The Polar Bears themselves are satisfied with the benefits（or advantages）of cold-water swimming.They say that their favorite form of exercise is very good for the circulatory system（循环系统）because it forces the blood to move fast to keep the body warm.Cold-water swimmers usually turn bright red after a few minutes in the water.A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.The main benefits（or advantages）of cold-water swimming are probably mental.The Polar Bears love to swim year-round;they find it fun and relaxing.As one 70-year-old woman says,"When I go into the water,I pour my troubles into the ocean and let them float away."According to the passage,some doctors believe it is true thatA.you are healthy if cold-water swimming turns your skin color blueB.cold-water swimming causes more heart attacks in summer than in winterC.cold-water swimming can make the body temperature dangerously highD.Polar Bears are bears swimming in freezing water
Very few of our birds stay with us the year round.Some come to us in the winter from the cold?north.Others come from the south to spend the summer with us.How do they know the way?Suppose?you were told to find your way to a place hundreds of miles away,do you think you could do it?Yet birds travel over mountains,forests,lakes and even across the oceans,and do not stray from?the path.They find their way back in the spring to the same orchard（果园）and the very trees where?they nested the summer before.It is wonderful how quickly birds travel such long distances from their summer homes to their?winter ones.Some birds have been known to fly hundreds of miles in a day.But others travel much?more slowly.Why do birds undertake these long journeys twice a year?Perhaps cold weather and lack of?food drive them from us in the autumn,but we cannot tell why they leave the sunny south to come?back to us in the spring.We know only that many of them like to make their nests and rear their?young in the north.We are sorry to see them go,but we know that when winter is over they will come back to us.Why do birds undertake those long journeys twice a year?A.It is because of cold weather in winter.B.It is because of lack of food in autumn.C.It is because of the hot weather in summer.D.There's some reason that is still not known clearly.
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单选题We find that some birds _____ twice a year between hot and cold countries.AtransferBcommuteCmigrateDemigrate