单项选择题

A．Time is limited.
B．This is the last one.
C．It might not be of good quality.
D．You should buy cheap things.
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单项选择题
From the passage, we should nap ______ each afternoon.
A．5 minutes
B．8 minutes
C．half an hour
D．over an hour
填空题
The bell indicating the beginning of class rang, ______ (interrupt) our game of football.
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