单项选择题

Success in diving requires not only skill and balance but also ______ alterness and concentration.

A．mental
B．manual
C．nervous
D．masculine
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单项选择题
A hot iron can scorch and discolor ______ fabrics quickly.
A．soft
B．delicate
C．frail
D．decent
单项选择题
As soon as the conference was over, all the participants went their ______ ways.
A．relative
B．homely
C．perspective
D．respective
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