单项选择题

Continuous short buzzes on the telephone indicate that the line is busy after you dial the telephone number.

A．open
B．out of order
C．disengaged
D．in use
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单项选择题
The land crab a forest-floor scavenger native to tropical America, migrates to the water to breed.
A．die
B．swim
C．mate
D．hatch
单项选择题
The policeman wrote down all the particularsof the accident.
A．secrets
B．details
C．benefits
D．words
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