单项选择题

Hawks serve an important purpose in the scheme of nature ______ on destructive rodents, such as mice and rats.

A. by preying
B. in order that preying
C. that they prey
D. than to prey
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单项选择题
The box was very large and heavy; in fact, it was so ______ that it could not be moved.
A. extravagant
B. plentiful
C. massive
D. excessive
单项选择题
Your reasons for demanding an increase in wages are ______.
A. inaccurate
B. inadequate
C. incompatible
D. incomplete
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