2. 外语
  3. The atmosphere, a narrow band of gases surrounding the Earth, is maintained by gravitational pull.

The atmosphere, a narrow band of gases surrounding the Earth, is maintained by gravitational pull.

admin2012-07-30  30
问题 The atmosphere, a narrow band of gases surrounding the Earth, is maintained by gravitational pull.
选项 A、clear
B、freezing
C、thin
D、poisonous
答案C
解析 窄的，薄的
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