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1. (2013江苏东台时堰中学第3阶段检测) 火星重力只约有地球重力的八分之三。

The gravity on Mars is only about  of  on the Earth.

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3. 你考虑过火星上的低重力吗?

Have you ever  on Mars?

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5. (2014 江苏泰州,12, ★★★) About  of the earth  covered with water,but we have less and less available fresh water.

   A. three-fourth;is

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                            (B)

    Is there intelligent (有智力的) life on other planets? For years,scientists said “no”,or “we don't know”. But today this is changing. Seth Shostak and Alexandra Barnett are astronomers (天文学家). They believe intelligent life exists (存在) somewhere in the universe.They also think we will soon contact these beings (人;生物) .

   Why do Shostak and Barnett think intelligent life exists on other planets? "Fhe first reason is time.Scientists believe the universe is about 12 billion years old.uThis is long enough for other planets to have intelligent life,say Shostak and Barnett.The second reason is size—the universe is huge. “ Tools like the Hubble Telescope (哈勃望远镜) have shown that there are at least 100 billion galaxies,says Shostak.wAnd our galaxy,the Milky Way,has at least 100 billion stars.Some planets going a-round these stars might be similar to Earth.?,

   In the past,it was hard to look for signs of intelligent life in the universe.But now,powerful telescopes (高倍望远镜) allow scientists to discover smaller planets—the size of Mars or Earth—in other solar systems. These planets might have intelligent life.

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Dear Mr President,

   I have been doing a project at school recently about animals in danger.! think their living cl  are terrible in China. I am writing to you to suggest w 2   we should do to help protect animals more.

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                                                 Yours sincerely,

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He  at  18.

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