2. 外语
  3. What is the main idea of the passage? The author organizes the discussion of the Earth’s atmosphere in terms of the ______.

What is the main idea of the passage? The author organizes the discussion of the Earth’s atmosphere in terms of the ______.

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问题 What is the main idea of the passage?
The author organizes the discussion of the Earth’s atmosphere in terms of the ______.
选项 A、role of volcanoes in its formation
B、occur in which changes occurred
C、time it took for the Earth’s surface: to cool and nitrogen to appear
D、chemical and physical features of gasses
答案B
解析
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