题目内容：

When did you 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 the winter to swim in freezing cold water. That day, the air temperature was 3 degrees. And the water temperature was a little 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 don’t 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 slow 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 the water tempreature is much greater in summer than in winter.

The Polar Bears themselves are satisfied with the benefits 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 could not try cold-water swimming.

The main benefits of cold-water swimming are probably mental. The Polar Bears love to swim all the 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.”

1.Doctors _________ .

A. have different ideas about the medical effects of cold-water swimming

B. believe swimming is helpful both in summer and in winter

C. enourage people to take part in cold-water swimming

D. point out the possible danger of blood illness during cold-water swimming

2.According to the passage, some doctors believe it is true that _______ .

A. Polar bears are bears swimming in freezing water    

B. cold-water swimming can make the body temperature dangerously high

C. you are healthy if cold-water swimming turns your skin color blue

D. cold-water swimming causes more heart attack in summer than in winter

3.The Polar Bears like to swim year-round, for _______ .

A. it is an easy way to keep the body warm in winter

B. they can stay young

C. they find it enjoyable and interesting

D. they might meet fewer troubles in life

4.Which of the following is TRUE according to the text ?

A.The Polar Bear is a club in which people swim to protect polar bears.

B. The club members are all over 60 years old.

C. There is no woman in the club.

D. None of the above.

5.This passage is mainly about _______ .

A. the requirements of the Polar Bear Club

B. a group of cold-water-swimming lovers

C. the Polar Bears’ life in New York

D. doctors’ ideas about cold-water swimming