单项选择题

Many species of animal have now __________ from the face of the earth.

A．dissolved
B．vanished
C．faded
D．escaped
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单项选择题
So conservationists hope they can __________ the area's outstanding natural beauty and satisfy the tourists, too.
A．reserve
B．retain
C．preserve
D．sustain
单项选择题
An employee who has finished the task efficiently and effectively will be given __________ over one who has not.
A．priority
B．privilege
C．publicity
D．privacy
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