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  3. Mars Express is mentioned because______. What does the word "they"(Para. 3) refer to?

Mars Express is mentioned because______. What does the word "they"(Para. 3) refer to?

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问题 Mars Express is mentioned because______.
What does the word "they"(Para. 3) refer to?
选项 A、the layers
B、wind-blown deposits
C、volcanic eruptions
D、the terrestrial rocks
答案A
解析 这是一道词义题。依据文章，"they"指的是the layers。
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考研英语一

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