单项选择题


A．basic
B．apparent
C．least
D．most
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单项选择题
A．byB．toC．asD．for
A．by
B．to
C．as
D．for
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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