单项选择题

If nothing is done to protect the environment, millions of species that are alive today will have become______.

A．deteriorated
B．degenerated
C．suppressed
D．extinct
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单项选择题
If we______ our relations with that country, we'll have to find another supplier of raw materials.
A．diffuse
B．diminish
C．terminate
D．preclude
单项选择题
He was bending over the basin and______ cold water on his face in order to keep himself a wake.
A．perishing
B．splashing
C．recurring
D．rotting
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