单项选择题

"Snowball Earth" might have occurred as a result of ______.

A．ice reflecting sunlight and heat
B．the growth of polar ice sheets
C．the increase of rainfall
D．the huge loss of carbon dioxide
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单项选择题
Greenhouse gases in Par
A．2 refer to ______.A. oxygenB. hydrogenC. carbon dioxideD. air
单项选择题
The passage informs us that ______.
A．Americans do not understand their own heritage and culture well
B．the author does not mind Americans' cultural blindness
C．Americans pay little attention to foreign customs and languages
D．America has no problems in the world because it's the most powerful country
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