Mars Express is mentioned because______. The author of this passage is mainly concerned with______.

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问题 Mars Express is mentioned because______.
The author of this passage is mainly concerned with______.

选项 A、the significance of discovery of water on the Mars
B、the achievements of U.S. in exploring the Mars
C、the performance of five craft launched to Mars
D、the fate of the science of Mars exploration

答案C

解析 这是一道主旨题。文章第一段先概要地说了5个飞行器总的表现,后几段分别细说。
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