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单选题
Metal detectors were installed in 88 city schools, mainly to keep ______ out of Schools.
A

cell phones

B

weapons

C

alcohol

D

drugs


参考答案

参考解析
解析:
细节理解题。根据文章第三段“The detectors were installed to keep weapons out of schools”可以得知,安装探测器是为了保证武器不进入校园。因此正确答案为B。
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