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单选题
Where do polar bears usually hunt seals?
A
On land.
B
In open water.
C
In openings in the sea ice.
D
At the bottom of the sea.
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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.
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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."
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B.cold-water swimming causes more heart attacks in summer than in winter
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单选题Do you know（）.A
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How to Protect the EnvironmentC
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问答题Although these bears are strong swimmers, they are no match for lightning swift seals in the water.
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单选题What's the mission of Polar Bears International?A
Saving energy.B
Conducting scientific research.C
Seeking international cooperation.D
Saving polar bears and their home.
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单选题According to the passage, which of the following statements is TRUE?A
Starving polar bears are increasingly coming into villages, where they may be killed either for food or safety.B
Polar bears can spend their entire lives on land if the sea ice melts completely.C
Two-thirds of the world's polar bears may disappear by 2050 as global warming continues.D
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问答题Polar bears have thick fur, big paws and other features that make them well prepared for life in their tough environment.
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单选题（）is capable of finding any 406MHZ beacons no matter where they are.A
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