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
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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
单项选择题
Unions would like more __________ working hours to replace the nine-to-five, forty-hour week.
A．flexible
B．changing
C．moveable
D．variable
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