单项选择题

One of the water ______ has burst and the kitchen is full of water.

A．tubes
B．pipes
C．conductors
D．channels
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单项选择题
The United Nations was ______ forty years ago and held a special conference in November 1985 to celebrate.
A．established
B．set
C．completed
D．settled
单项选择题
The airplane ______ in the hills.
A．smashed
B．crashed
C．clashed
D．flashed
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