单项选择题

A．The man should learn to slow down.
B．The man is always tired lately.
C．They aren’’t going very fast.
D．They aren’’t going to be on time.
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单项选择题
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单项选择题
According to the author, IPCC pictures put forward by Houghton shows ______.
A．effects of global warming
B．causes of global warming
C．examples of human damage to the environment
D．instances of natural disasters threatening human existence
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