单项选择题

The little boy was sad because he had made a big mistake.

A. large
B. serious
C. good
D. bad
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单项选择题
The Americans recognize that the UN can be the channel for greater diplomatic activity.
A. place
B. medium
C. resort
D. tunnel
单项选择题
Our statistics show that we consume all that we are capable of producing（）。

A. waste
B. buy
C. use
D. sell
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