What is the main idea of the passage? [br] The author organizes the discussion o

游客2024-01-05  20

问题 What is the main idea of the passage? [br] 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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