单项选择题

Hundreds of species are declared to be extinct in the coming century.

A．die away
B．leave off
C．die out
D．leave out
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单项选择题
He has established himself to be a competent manager by his successfully handling several difficult tasks.
A．definite
B．effective
C．qualified
D．deficient
单项选择题
Successful leaders dominate events rather than react to them.
A．control
B．contribute
C．convey
D．contact
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