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-blow]a 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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