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
The helicopter （）a light plane and both pilots were killed.

A．coincided with
B．stumbled on
C．tumbled to
D．collided with
单项选择题
As soon as the boy was able to earn his own living he （）his parents' strict rules.

A．defied
B．refuted
C．excluded
D．vetoed
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