71. According to the passage, which of the following statements is true?

　　　 A. Some additives besides nitrates can cause cancer.

　　　 B. All additives cause illness.

　　　 C. All additives can cause cancer.

　　　 D. Nitrates except other additives can cause cancer.

70. What are nitrates used for?

　　　 A. They keep flavor of food.

　　　 B. They keep the color of meat.

　　　 C. They keep food fresh.

　　　 D. They make animals fatter.

69. According to the passage, what has science done to mankind?

　　　 A. Because of science there is no polluted food any more.

　　　 B. Science makes food have less value.

　　　 C. As a result of scientific invention, some things that may be harmful have been added to our food.

　　　 D. Now the scientists can keep the color of meat but not that of vegetable.

68. The word “elixir” in the last sentence probably means something that can keep people __.

　 A. healthy　　　　 B. wealthy　　　　 C. young　　　　　 D. happy

D

　　　 The food we eat seems to have profound effects 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 80 percent of all human illness are connected with diet and 40 percent of cancer is connected with the diet as well that food is connected with illness is not a new discovery. In 1940’s scientists realized that nitrates(硝酸盐), which are often used to keep color of meat, and other additives(添加剂)caused cancer. However these additives remain in our food and it becomes more difficult to know which additives are helpful or harmful. Farmers sometimes give drugs to animals not because the animals are ill but because they want to sell the animals at higher prices. For example farmers try hard to make animals grow big so that they can sell the big animals for more money. Although the Food and Drug Administration has tried again and again to control farmers to do so, farmers go on doing this.

67. The implied meaning of the passage is that __.

　 A. anyone can learn to do something no matter how old he may be

　 B. the electrical engineer learned to be an artist to become famous

　 C. the man who entered the medical college at 70 came out at the top of the list

　 D. every one can be successful if you try to learn no matter how old he may be

66. If you wish to stay young, above all, you should __.

　 A. keep your mind awake and active　　　 B. make your life more interesting

　 C. keep your mind from being harmed　　　 D. keep in touch with other people

65. Which of the following best expresses the main idea of this passage?

　 A. Staying young is the only youth elixir.　 B. Learning at least one new thing every day.

　 C. Never too late to go back to school.　　 D. The secret of staying young.

64. The best title for this passage is _____.

　 　　 A. The Four Food Groups　　 　　　　　　　　 B. A Healthy Diet

　 　　 C. Your Body And Food　　　 　　　　　　　　　 D. Food And Your Health

C

　　 My secret of staying young is quite simple: devote your attention to the part of you that's young and growing - your brain. Keep your mind awake and you will stay young all over. These are exciting times. Take an interest in the world around you, and make a point of learning one new thing every day.

　　 No matter how old you are, it's not too late to make your life more interesting. I know a housewife without knowledge in the past who made herself into an excellent industrial designer. I know an old electrical engineer who has become a highly paid artist.

　　 Get over the idea that you are too old to go back to school. I know a man who entered a medical college at 70. He got his degree with honors and became a famous doctor. Another man went to a law school at 71 and now is an active lawyer.

　　 No matter how old people are, staying young is easy for these who live in the future. You can do it if you are active enough to try. Keep your mind active and awake: that's the only youth elixir.

63. The underlined word “dairy” in the second passage means _____.

　　 A. the food made out of cows such as milk and butter

　 B. she shop that sells milk and butter

　 C. a farm where cows are kept

　 D. a place where milk products are made.

62. In this passage the writer mainly tells us that _____.

A. every person needs food to grow well

B. taking exercise can keep your body strong

C. the right kind of food with exercise will keep you healthy

D. enough energy helps people think more quickly