问题: Theatmosphereconsistsof_________.
A: containsalayerofozonegases.
B:about42degreescolderthanontheground.
C:21%oxygenbyweight.
D:lessthan1%ofxenonbyvolume
E:about75degreescolderthaninInterlaken
F:iswarmedbytheearth’sheat.
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