单项选择题

By comparing past problems with present ones, the author draws attention to _________.

A．the significance of this crisis
B．the inadequacy of governments
C．the similarity of the past to the present
D．the hopelessness of the situation
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单项选择题
It is implied in the last paragraph that _________.
A．only those lived near sea could survive
B．lack of oxygen led to the extinction of most of the species
C．The living space was too small to hold so many species
D．Global warming is related to human activities
单项选择题
The greenhouse effect resulted hundreds of million years ago when _________.
A．the atmosphere changed dramatically
B．oxygen levels on the earth became lower
C．the sea levels became lower greatly
D．the sediment gave off enormous carbon and methane
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