单项选择题

We have no time to lose. Let's ______ on the task before us.

A．enter
B．impose
C．concentrate
D．overwork
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单项选择题
Panic swept through the swimmers as they caught sight of a huge shark approaching menacingly.
A．Tension
B．Excitement
C．Nervousness
D．Fear
单项选择题
An international treaty signed several years ago bans trade in plants and animal of endangered species.
A．forbids
B．eliminates
C．promotes
D．protects
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