单项选择题

The government has launched a massive campaign against crimes in the big cities.

A. proposed
B. decided
C. begun
D. studied
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单项选择题
Over six million citizens of the United States benefit from private pension plans each year.
A. unauthorized
B. confidential
C. nontransferable
D. non-governmental
单项选择题
The widespread use of X-rays poses the risk of overexposure to radiation.
A. medical
B. spacious
C. experimental
D. general
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