material used for running tracks in schools across China may be danger to children's hea

发布时间：2020-08-17 09:22:40

     material used for running tracks in schools across China may be      danger to children's health.
A. /；a
B. The；a
C. /；the
D. The；the

网友回答

A. /；a
(答案→)B. The；a
C. /；the
D. The；the
解析：a danger为抽象名词具体化的用法。
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