2. 外语
  3. A New finding about the upper atmosphere B Stratosphere C Ionosphere D The composition of the permanent gases in the atmosph

A New finding about the upper atmosphere B Stratosphere C Ionosphere D The composition of the permanent gases in the atmosph

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问题 A  New finding about the upper atmosphere
B  Stratosphere
C  Ionosphere
D  The composition of the permanent gases in the atmosphere.
E  The suspension of dust
F  Tropophere
*
选项
答案F
解析
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