题目内容：
Aiming to retrieve the Mars rover Opportunity，engineers are imitating Mars surface conditions in a testing laboratory．
参考答案：
答案解析：
单选题：Aiming to retrieve the Mars rover Opportunity，engineers are
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The 20th—century poem suggests to something we have been abl
The 20th—century poem suggests to something we have been able to find nothing ab
Careful testing is necessary before any more experiments can
Careful testing is necessary before any more experiments can continue with the e
George Emest Morrison，an Australian，traveled the “five—foot
George Emest Morrison，an Australian，traveled the “five—foot roads，”or foot paths
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外资股发行的招股说明书可以采取（ ）形式。
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