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
The two leaders made a show of unity at the press conference, though they had notably ______ messages.
A．discontinuous
B．discreet
C．discordant
D．disadvantageous
单项选择题
They were tired, but not any less enthusiastic ______ that account.
A．on
B．by
C．for
D．with
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