单项选择题

To______ the heat released from the inside machine, powerful ventilators were used.

A．dispatch
B．dissipate
C．distract
D．displace
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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
单项选择题
That______ criminal was finally put to death.
A．notorious
B．irrespective
C．numerical
D．grim
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