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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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
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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