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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It is very considerate of you to remember my birthday.
A. thoughtful
B. considerable
C. careful
D. concerned
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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