We know the atmosphere as . The main topic of the passage is .

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问题 We know the atmosphere as ______.
The main topic of the passage is ______.

选项 A、composition of the atmosphere
B、pressure from the atmosphere
C、air pollution in the atmosphere
D、the relationship between the atmosphere and men

答案D

解析选项A、B、C文中都有涉及，但它们主要说明的是D。

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成人本科学位英语

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