单项选择题

A long line of traffic had to wait at the ______ until the train had passed.

A. crossroads
B. junction
C. level-crossing
D. bridge
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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
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
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