单项选择题

However, at times this balance in nature is(), resulting in a number of possibly unforeseen effects.

A. troubled
B. disturbed
C. confused
D. puzzled

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单项选择题
He is a very () character; he is never relaxed with strangers.

A. self-confident
B. self-conscious
C. self-evident
D. self-serving
单项选择题
The examination has been cancelled. You () all that review, after all.

A. didn’t need to do
B. needn’t do
C. needn’t have done
D. needn’t to do
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