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
At ______ time does the salesgirl get up late in the morning. She is too busy to take a good rest.
A．no
B．any
C．each
D．one
单项选择题
The lecture was supposed to start at 8:00 a.m. , but the speaker ______ until 8. 30.
A．didn't turn up
B．don't turn up
C．haven't been turned up
D．hadn't been turning up
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