单项选择题

The atmosphere is as much a part of the earth as ______its soil and the water of its lakes, rivers and oceans.

A．are
B．is
C．do
D．has
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单项选择题
Those were the graduate students ______ to do the research work in the lab.
A．to whom it was their responsibility
B．of whom the function was
C．whose responsibility was
D．of whom with the responsibility
单项选择题
He _______ live in the countryside than in the city.
A．would rather
B．had better
C．may as well
D．prefers
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