D
Sweet potatoes are fat-free, high in fiber and full of the vitamins that research suggests reduce your risk of life-shortening diseases. To stay healthy, we must eat more fruits and vegetables, and sweet potatoes are a great source of beta carotene(胡萝卜素)and other carotenoids(which the body turns into vitamin A). According to a study of the diets of almost 90,000 nurses, eating about one cup a day of fruits and vegetables rich in carotenoids can cut your risk of stroke in half and reduce your risk of heart disease by 22 percent. Other research suggests beta carotene protects against breast, lung and stomach cancers.
Beta carotene is the most famous member of the carotenoids family. In face, a medium-sized sweet potato contains nearly 12mg of beta carotene(anti-aging experts usually suggest 6 to 11 mg per day). Sweet potatoes are also a low-fat source of vitamin E. Research has linked high E diets with a lower risk of heart disease. This vitamin pill in an orange jacket also packs a vitamin C punchit which has more C than apricots (a kind of fruit). Research suggests that vitamin C protects against ailments (小疾) ranging from cataracts(an eye disease) to cancer. In addition, a UCLA (University of California Los Angeles) study linked high vitamin C diets with a longer life. Recent studies have showed that antioxidant Vitamins C, E and beta carotene fight a fierce battle against free radicals (自由基），which cause cell (细胞)damage and lead to various illness. Therefore, to keep fit, eat more sweet potatoes.
10. According to the text, there exists a lot of ______in sweet potatoes.
A. fiber, beta carotene, other carotenoids, Vitamin E and C
B. beta carotene, other carotenoids, fiber, Vitamin A and E
C. Vitamin A, beta carotene, fiber, Vitamin E and C
D. beta carotene, other carotenoids, Vitamin A and E
11. This text as a whole suggests that eating sweet potatoes can help______.
A. cut your risk of stroke and heart disease
B. protect against breast, lung and stomach cancers
C. protect against ailments ranging from cataracts to cancers
D. you stay healthy and reduce your risk of life-shortening diseases
12. “ This vitamin pill in an orange jacket”in the passage refers to______.
A. sweet potato     B. vitamin C pill
C. vitamin E pill    D. beta carotene
13. The best title of this passage might be______.
A. The vitamin superstar
B. On sweet potatoes
C. Beta carotene and vitamins
D. Diet and disease

VIII. 句子改错。（每句均有一处错误）
1. His restaurant ought to full of people.                  __________
2. He didn’t know what the matter was.                   __________
3. He had better to do some research.                     __________
4. The beautiful lady married with a poor artist last month.    __________
5. Xiao Ming is preparing the exam while his mother is preparing supper.
                                                   __________
6. When he returned to home, he found his wallet stolen.     __________
7. The blind man was seen cross the street.                __________
8. The price of the car is very expensive.                  __________
9. How much does the new dress spend you?               __________
10. He did not look forward to be in debt.                  __________
11. Don’t you think it would be better if you are a bit thinner?  __________
12. So it is that they said.                               __________

IX. 书面表达
   请根据下列提示要点，以“the Ways to Keep Healthy” 为题，写一篇短文。
提示：
1. 人人都想保持健康。
      2．饮食要健康：多吃水果、蔬菜，因为它们富含纤维素和维生素；少吃黄油、奶酪、咖啡和巧克力，因为它们含糖和脂肪太多，糖和脂肪使你迅速变胖。
3．有良好的生活习惯：定期锻炼，充足的睡眠，不要过度劳累，不抽烟等等。
要求：
1. 短文须包括上述所有要点，可以适当增加细节,使短文连贯。
2．词数约100左右。

Unit 2 Healthy eating  Keys：
知识运用
I．单词拼写
1. diet    2. energy   3. sigh         4. slimming   5. lies
6. glared  7. raw     8. Consumers    9. research    10. limited
II. 短语翻译
1. balanced diet    2. be tired of     3. throw away      4. tell lies
5. get rid of       6. get away with sb     7. hurry by   8. be full of
9. be made of   10. be amazed at  
11. 负债     12. 谋生       13. 作一番调查        14．减肥餐馆 
15. 不再     16. 渴望/盼    17. 油腻、难消化的食物
18. 减少、削减             19. 打探、 窥探       20. 瞪着某人
III. 词语辨析：
A. l. lay         2. laid        3. lied     4. lay   5. lay
B. 1. searched    2. research    3. search
C. 1. before long  2. long before
D. 1. preparing for    2. preparing, preparing for     3. preparing
E. 1. are made from   2. is made of   3. is made in   4. is made up of
IV. 单项填空
1. BCDAB     6. BCDBC    11. BCAAC    16. ADDBC
V. 语法专练
A. 1. He ought not (oughtn’t)to help his brother work out the problem.
    2. Ought Tom to go to have a rest?
   3. ought they?
B. 1. must/have to     2. were able to    3. can’t/couldn’t   4. mustn’t
   5. ought to        6. ought to       7. used to         8. ought to
9. wasn’t able to   10. must
能力提升
VI. 单项填空
1. CBCAC      6. ABDCD     11. AADBD     16. CBBAD
VII. 阅读理解
A篇：ADC    B篇：BDC    C篇：BAD      D篇：ADAA
VIII. 句子改错。（每句均有一处错误）
1. full—be full       2. what the matter was—what was the matter
3. 去掉to          4. 去掉with    5.(第一个) preparing—preparing for
6. 去掉to          7. cross—to cross     8. expensive—high
9. spend—cost      10. be—being        11. are—were     12. that--what
IX. 书面表达
A possible version:
Everyone hopes to be in good health. But how? Here are some ways to keep healthy.
First, you need a healthy diet. It is better to eat fresh fruit and vegetables because they have a lot of fibre and vitamins. Don’t eat the food which contains too much sugar and fat, like butter, cheese, coffee and chocolate. Fat and sugar make people put on weight easily.
Second, good living habits are very important. You should do regular exercise to build up your body. Besides, enough rest is necessary for your health. You need 8 hours’ sleep a night and don’t work too hard. Smoking is a bad habit, so never smoke.
In a word, healthy food and good living habits are good ways to keep healthy.

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