单项选择题

A．Doctor and patient.
B．Passenger and bus driver.
C．Customer and merchant.
D．Boss and secretary.
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单项选择题
According to the passage, 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
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