单项选择题

The atmosphere ______ certain gases mixed together in definite proportion.

A．consists of
B．consists in
C．insists on
D．persists in
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单项选择题
Although the pay is not good, people usually find social work ______ in other ways.
A．grateful
B．payable
C．respectful
D．rewarding
单项选择题
A large part of human activity, particularly in relation to the environment, is ______ conditions or events.
A．in response to
B．in favour of
C．in contrast to
D．in excess of
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