B

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 fact, 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.

4. 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

5. 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

6 “ 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

7. 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

第2课时

课前预习

一1---5 DCDBA 二1----5 BBDCA

实战演练

一 1---5 BDABB 6---10 CDCCA

二 1.felt改为feeling 2.mustn’t改为can’t 3.去掉time或weeks改为weeks’4.served前加is/was 5.such改为so 6.with改为of 或full 改为filled 7.life 改为living 8. lie改为lies 9.benefit 后加from 10 before long 改为long before

三 1.The company is around $20,000 in debt .2 In those days , the poor earned their living by begging . 3. I won’t have you getting away with cheating in the exam . 4. He wasted so much time that he didn’t pass the exam . 5.You should combine exercise with a healthy diet .

反馈检测

1—3 ADC 4—7 ADAA

【总结】：单元同步测试题就为大家介绍到这了，希望高一的同学们好好学习，在高一阶段打好基础。也希望大家在精品学习网学习愉快。

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