单项选择题

The average speed of a ball hit by a Pingpang racquet (球拍)is the ______ among all ball games.

A．lowest
B．highest
C．quickest
D．most full
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单项选择题
Finally, the thief handed everything ______ he had stolen to the police.
A．which
B．what
C．whatever
D．that
单项选择题
A teacher should not show ______ for any one of his pupils.
A．profession
B．preference
C．priority
D．prosperity
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