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
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单项选择题
Capital punishment was (abolished) some years ago in some states of the U. S.
A．created
B．decorated
C．improved
D．eliminated
单项选择题
Through a procedure known as time-sharing, one large computer can be employed (simultaneously) by lots of small users.
A．ahead of time
B．all the time
C．at the same time
D．in time
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