单项选择题

Be sure not to _______ his help. Do it all by yourself.

A．account for
B．press for
C．call on
D．reckon on
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单项选择题
There is supposed to be a safety _______ which makes it impossible for trains to collide.
A．appliance
B．accessory
C．machine
D．mechanism
单项选择题
If too many of these rare animals are killed, their kind will _______.
A．die away
B．die down
C．die out
D．die from
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