(B)

The Internet has become part of teenage life.There’s report on 3375 students aged from 10 to 18 in seven Chinese cities.It says that 38 percent of them believe they use the Internet often.While most of them get useful information and use the Internet to help in their studies, some are not using it in a good way.Many are playing online games too much.A few even visit Web sites they should not look at.Bad things can happen if young people spend too much time on the Internet.

In order to help young people use the Internet in a good way, a textbook on good Internet behavior has started to be used in some Shanghai middle schools this term.It uses real examples to teach students all about good ways of using the Internet.It gives useful advice such as its good to read news or find helpful information to study.Some students also make online friends.But if you are meeting a friend offline, let your parents know.

 Teachers and parents all think the book is a very good idea.It will teach students how to be a good person in the online world.It will be a guide for teens to use the Internet and keep students away from bad sites.

60.The underlined word“it”means____________.

   A.the book    B.report    C.the Internet   D.useful information

61.From the report,about          students between 10~18 years old in the seven cities use the Internet often.

   A.3 375    B.1 280    C.2 100    D.3 000

62.What do most of the students do on the Internet?

   A.To make online friends.

   B.To play online games.

   C.To get useful information to help in their studies.

   D.To visit Web sites they should not look at.

63.Why do teachers and parents think the book is a good idea?

   A.Because it helps with the students’ studies.

   B.Because it gives useful information for studying.

   C.Because it is used in Shanghai middle schools.

   D.Because it teaches students how to be a good person in the online world.

E

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 damage and lead to various illness. Therefore, to keep fit, eat more sweet potatoes.

72. 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

73. 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

74. “ 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

75. The best title of this passage might be______.

   A. On sweet potatoes             B. The vitamin superstar

   C. Beta carotene and vitamins      D. Diet and disease

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