单项选择题

A．All right.
B．Disappointing.
C．Better than expected.
D．No good at all.
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单项选择题
What does the author say about straight ,horizontal bars painted across roads
A．They are falling out of use in the United States.
B．They tend to be ignored by drivers in a short period of time.
C．They are applicable only on broad roads.
D．They cannot be applied successfully to traffic circles.
问答题
Doctors use medical histories to help diagnose problems and ________ (为病人开出治疗处方).
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