单项选择题

In order to improve our standard of living, we have to accelerate production.

A. step up
B. decrease
C. stop
D. control
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单项选择题
The child's abnormal behavior puzzled the doctor.
A. bad
B. frightening
C. repeated
D. unusual
单项选择题
Her behavior is extremely childish.
A. simple
B. immature
C. beautiful
D. foolish
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