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
A   at constant rate
B   in a few years
C   an the weight of the atmosphere
D   within the troposphere
E   oxygen and nitrogen
F   it consists of electrically charged particles called irons which from sun
选项
答案E
解析
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