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6. Only a tiny part of the energy that comes from the Sun,         0. 023% ,is actually used by green plants to produce food.

   A. much   B. approximately

   C. punctually   D. mainly

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5. Many AIDS patients think it        to have AIDS,so they usually keep it a secret from others.

   A. doubtful   B. harmful   C. shameful   D. painful

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4. The purpose of this first step is to        the nature and importance of the problem,but nobody would listen.

   A. find   B. discover   C. clarify   D. classify

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3. They called on Western nations to        more money to the poorest nations in Africa.

   A. earn   B. commit   C. raise   D. save

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2. Wheh you get involved in sports,a lot of racial        are broken down because players develop friendship quickly.

   A. approaches   B. threats   C. barriers   D. hardships

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1. Nowadays senior high school students are burdened with too many         ,which is making them less and less confident.

   A. motivations   B. expectations

   C. amusements   D. opportunities

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10. By the time this letter reaches you,I        the country (leave)

當(dāng)你收到信時(shí),我將巳經(jīng)離開這個(gè)國家了。

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9. With        on the family album,Jack thought of the fun he had when he lived with his grandparents (fix)

眼盯著家庭影集,Jack回想著和祖父母一起生活時(shí)的歡樂。

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8. The local government decided to close down some of the factories,which           the environment (harm)

地方政府準(zhǔn)備關(guān)閉一些巳經(jīng)對環(huán)境造成很大傷害的工廠。

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7.       ,the train will have left (by)

在你到達(dá)車站之前,火車就已經(jīng)走了。

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