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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单项选择题

It can be inferred from the passage that global warming is _______.

A．harmful
B．irrelevant
C．favorable
D．desirable

单项选择题

According to the passgae, the sentence But if the earth...for optimum comfort ( in the 3rd paragraph) means_______.

A．there is an unseen hand controlling the earth's movement
B．there is an operating manual warning people against air-conditioning in the factory
C．people should prepare operating manuals to tell workers how to get greater comfort
D．people have been enjoying the most comfortable climate in Earth's history