单项选择题

Rescue workers continued the delicate task of sifting through tons of concrete and ______ to try to reach possible survivors.

A．scraps
B．leftovers
C．debris
D．residues
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单项选择题
People who like to wear red clothes are more likely to be talkative and ______.
A．lucrative
B．introverted
C．vivacious
D．perilous
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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