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
Just as there are occupations that require college or even higher degrees, so too are there occupations ______ technical training is necessary.
A. for which
B. in which
C. to which
D. at which
单项选择题
She was complaining that the doctor was ______ too much for the treatment he was giving her.
A. expending
B. offering
C. costing
D. charging
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