单项选择题

Hurricanes are severe cyclones with winds over seventy-five miles an hour ______ originate over tropical ocean waters.

A．which
B．who
C．where
D．how to
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单项选择题
If you want children to work hard you must ______ their interests instead of their sense of duty.
A．appeal to
B．look into
C．give rise to
D．go in for
单项选择题
Outside my office window there is a fire ______ on the right.
A．escape
B．ladder
C．steps
D．stairs
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