单项选择题

According to Dr. Weiss, the second cool and dry period eventually

A．changed the growing season.
B．spurred the use of canals.
C．forced the farmers to desert agriculture.
D．led to declining populations.
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单项选择题
From the first four paragraphs, we can infer that the dawn of civilization
A．was accompanied by hardships of human existence.
B．is a mystery as yet unknown to mankind.
C．can be attributed to the innovative sparks of ancestors.
D．was recorded by history books ending at that time.
单项选择题
The passage is mainly about
A．the relationship between climate change and civilization.
B．the history of global climate change.
C．the interaction between nature and human society.
D．the impact of the spread of agriculture:
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