单项选择题

To______ is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment.

A．conserve
B．conceive
C．convert
D．contrive
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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
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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