閱讀理解

　　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 (胡蘿卜素)and other carotenoids (類蘿卜素). 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　導(dǎo)解：從文中第一段倒數(shù)第二句可知維生素A并非是含在sweet potatoes內(nèi)，而是人體將類蘿卜素轉(zhuǎn)化為維生素A，因此可排除B，C，D，則A正確．

　　2．D　導(dǎo)解：由文中可知類蘿卜素可防中風(fēng)和心臟病，胡蘿卜素可防哮喘、肺癌和胃癌，維生素可防白內(nèi)障癌變．因此可知D正確．

　　3．A　導(dǎo)解：全文都在講述sweet potato的成份和功用，又通過(guò)上下文理解也可知．

　　4．A　導(dǎo)解：由全文我們可知sweet potato的成份很多，尤其是維生素的含量，而這些維生素的功用對(duì)于人體是非常重要的，由此可判斷只有A才涵蓋了全文內(nèi)容．


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