题目内容

【题目】Mary _______ have arrived ten minutes earlier but her flight was held up because of the heavy fog.

A. need B. can C. should D. must

【答案】C

【解析】

试题分析:考查情态动词和虚拟语气。句意:玛丽本应该十分钟前到,但她乘坐的航班因大雾而延误了。情态动词+have done可以表示对过去事情进行推测,need have done本来需要做某事;can/cant have done(不)可能已经做了某事;must have done一定已经做了某事;should/shouldnt have done本(不)应该做某事。这里指的是本应该早点到,故选C。

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About 90 percent of Australians who develop melanoma survive thanks to early diagnosis and treatment. If left untreated, however, the disease can be fatal.

Convincing younger people in Australia about the dangers of overexposure to the sun is a battle campaigners are constantly waging.

Veronica Manock, a 21-year-old student, had two major operations to remove a cancerous tumor from her leg.

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Other researchers in Australia are investigating genetic treatments to skin cancer. There is a pressing need for such research to produce effective treatments. Australians, the majority of whom are fair-skinned(浅肤色的), are four times more likely to develop a melanoma than people in Canada, the United States or Great Britain.

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A. Rose Bengal the cause of skin cancer.

B. Rose Bengal a tool to fight against skin cancer.

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D. Melanoma—the threat to health.

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【3】From what Veronica Manock said , we can know _______.

A. people havent realized overexposure to the sun is dangerous

B. mole on the leg is dangerous.

C. people can do nothing to protect themselves from melanoma

D. nothing can be done to deal with the disease.

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A. Englishmen. B. Canadians.

C. Americans. D. Australians.

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