阅读理解 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, 题目和参考答案——青夏教育精英家教网—

阅读理解

　　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 (类萝卜素). 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 (which the body turns into vitamin A)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 or 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 punch—it has more C than apricots ( a kind of fruit). Research suggests that vitamin C protects against ailments ranging from cataracts (an eye disease)to cancer. In addition, a UCLA (University of California, Los Angeles)study linked high vitamin C, E and beta carotene fight a fierce battle against free radicals (自由基), which cause cell damage and lead to various illnesses. Therefore, to keep fit, eat more sweet potatoes.

1．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 carotennoids, vitamin A and E

2．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 cancer

C．protect against ailments ranging from cataracts to cancer

D．you stay healthy and reduce your risk of life-shortening diseases

3．“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

4．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

答案：A;D;A;A
解析：

　　1．A　导解：从文中第一段倒数第二句可知维生素A并非是含在sweet potatoes内，而是人体将类萝卜素转化为维生素A，因此可排除B，C，D，则A正确．

　　2．D　导解：由文中可知类萝卜素可防中风和心脏病，胡萝卜素可防哮喘、肺癌和胃癌，维生素可防白内障癌变．因此可知D正确．

　　3．A　导解：全文都在讲述sweet potato的成份和功用，又通过上下文理解也可知．

　　4．A　导解：由全文我们可知sweet potato的成份很多，尤其是维生素的含量，而这些维生素的功用对于人体是非常重要的，由此可判断只有A才涵盖了全文内容．

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