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单项选择题

镇咳药连续口服一般不应超过（）天。

A.1
B.3
C.5
D.7

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热门试题

单项选择题What can we know from the sentence“(Elvis Presley) he sounded too much like a hillbilly?”

A．His singing style has an obvious element of country.
B．It is criticizing Presley for not singing well.
C．He has a strong southern accent.
D．It is devastating to Presley’s career.

单项选择题针对高度屈光参差、及高度角膜性散光（特别是不规则散光），先天性眼球震颤，应首选？

A.角膜接触镜
B.渐进片
C.视功能训练
D.框架眼镜