单项选择题

______ the water left in the kettle, the doctor put several things he unwrapped from a handkerchief.

A．At
B．To
C．Within
D．Into
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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
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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