B

    What weighs 3500 pounds(1600kg)and lived 60 million years ago?Are you thinking of

dinosaurs?Guess again!You don,t have to go to a museum to see these creatures.They are alive

and swimming in the warm coastal waters of Florida.

     Manatees(海牛)have lived a peaceful existence in the warm waters  of  Florida  for  60

million years.However,they are now an endangered species.This means that if humans don,t do

something to save them,they will soon go the way of dinosaurs.

     Humans have made life very difficult for manatees.One big danger that humans have

introduced is the speedboat.Because manatees are mammals.they need to come to the surface to breathe about every 5 to 6 minutes.This means that they are in constant danger of being caught in the propellers(螺旋桨)of speedboats.And boating aceidents are the greatest cause of death for them.

    Manatees are in extra danger when they are in their sleeping or“torpor”state.They still

have to come to the surface for the air,but sometimes they are too sleepy to avoid the danger of approaching boats.

    Another danger for manatees is the pollution that humans produce.Due to human pollution,

a deadly plant called red tide had increased greatly in the Gulf of Mexico.The plant,or algae,

t11riVes(繁茂)on pollution.It wiped out nearly 20 percent of the total manatee population on

earth.

    Humans can help to save manatees。The government has established boating speed limits to

 give the manatees.a chance to escape approaching speedlsoats.Everyone can help by cutting

 down on waste and pollution to protect the waters for the manatees.

    One famous singer,Jimmy Buffet,has helped save the manatees.He co-founded the Save the Manatee Club(SMC).SMC had begun an adoption(收养)program for the manatees.For a fee,sponsors(资助者)can name a manatee.Donations are used to help protect the manatees and their habitat.

45.The manatee is the kind of animal that___________.

    A.1ikes living in the cold waters of Florida      B.will die out if not protected in time

    C.call dive in the deep sea for hours             D.is the biggest living animal on earth

 46.Why is it dangerous for manatees to be in a torpor state?

    A.Because they come to the snlface to breathe,and that is when they are hunted.

    B.Because they eat deadly algae,and this makes them too sick to avoid danger.

    C.Because they live in groups and therefore they are easily hurt by passing boats.

    D.Because they are sleepy when they surface,so they can,t avoid approaching boats.

47.The death of the manatees is largely due to__________.

  A.human hunting                       B.human pollution

  C.speedboat accidents                   D.deadly plants

 48.To help protect manatees,people should_________.

    A.never go speed boating in their living habitat

    B.keep the waters of Florida free from pollution

    C.have manatess named by sponsors without a fee

    D.wake manatees up from their torpor state

III.阅读理解(共20小题;每小题1.5分;满分30分)

A

The food we eat seems to have a great effect on our health. Although science has made big steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of human illness is related to food and forty percent of cancer is related to food as well. That food is related to illness is not a new discovery. In 1945, some researchers realized that things commonly used to keep color in meats and other food additives(添加剂)caused cancer.

Yet, these additives remain in our food, and it is difficult to know which things on the wrappings of foods are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin (青霉素) to their animals, and because of this, penicillin has been found in the milk of cows. Sometimes similar tings are supplied to animals not for their health, but just to make a profit.

The farmers are simply trying to fatten the animals in order to get a higher price on the market. Although some countries have tried to control such things, the practice continues.

51. According to this passage, we can know___________.

A. cancer was discovered in 1945

B. science has made food unfit to eat

C. perhaps most of human illness is caused by what we eat

D. perhaps most kinds of cancer are related to what people eat

52. The additives in food_________.

  A. are bright and colorless                    B. have indirect effects on our health

  C. have direct effects on our health           D. have direct and indirect effects on our health

53. People use additives_________.

  A. to change color of the food                B. to make food more unfit to eat

  C. to take off the diseases of the food         D. to improve the color and taste of the food

54. Which of the following is Not true?

  A. We needn’t take care of what we eat.

B. Some wrappings of food are harmful.

  C. “The practice continues” means “things are still going on like that”.

D. Farmers try to make more money on the market by fattening their animals.

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