选择正确的答案 Man as been to the moon .It has been the first step to the

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选择正确的答案 Man as been to the moon .It has been the first step to the
Man as been to the moon .It has been the first step to the future travels in space .The moon is much nearer to the earth than all the planets .Venus ( 金 星 ),the nearest planet to the earth is millions of kilometers away Traveling to the planets will be man’s next step .It will be more difficult than traveling to the moon and certainly more exciting ,In 1997,an American spacesjip reached nearest planet from the earth .A wonderful robot slowly walked on the planet and worked hard .It sent a lot of information back to the earth .The most exciting piece was thart there used to be a lot of water on Mars .The American scientists ased ,“Is there any life on Mars ” Unluckily ,no life was found there ,but American scientists do not lose heart ,they still keep on trying .Russian spaceships have found that it is so hot on Venus that there must be no life there .Spaceships of the future will be bigger and faster .They will be a

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