单项选择题

The doctor told him to be careful when taking sleeping pills because too many could be.

A．lethal
B．vital
C．wholesome
D．sanitary
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单项选择题
As the city has become increasingly ______ and polluted, there has been a growing realization that certain action urgently needed.
A．flourished
B．boosted
C．congested
D．mingled
单项选择题
So ______ was the mood of the meeting that an agreement was soon reached.
A．resentful
B．amiable
C．suffocating
D．gloomy
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