单项选择题

Sadly, the Giant Panda is one of the many species now in danger of（）

A．migration
B．extinction
C．destruction
D．extraction

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单项选择题
The detective and his assistant have begun to （）the mysterious murder.

A．look into
B．see to
C．make over
D．come through
单项选择题
The wood was so rotten that, when we pulled, it （）into fragments.

A．broke away
B．broke off
C．broke up
D．broke through
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