单项选择题

This book mainly focuses on Shakespeare, but it also _________ other playwrights as well.

A．touches upon
B．touches up
C．touches off
D．touches down
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单项选择题
Water, when boiled, always _________ steam.
A．give in
B．gives up
C．gives off
D．gives away
单项选择题
It is generally believed that swimming is one of the best ways for a person to _________ good health.
A．reserve
B．sustain
C．preserve
D．maintain
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