单项选择题

This kind of animals is on the verge of dying out.()

A.drying up
B.extinction
C.dying off
D.distinction

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单项选择题

We are disappointed to find out that he has made a fatal mistake().

A.crucial
B.foolish
C.stupid
D.big

单项选择题

They are endeavoring to reform the present rules.()

A.trying
B.working
C.doing
D.making

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