单项选择题

Under the present system, state enterprises must （）all profits to the government.

A．turn down
B．turn up
C．turn out
D．turn in

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单项选择题
When you put up wallpaper, should you （）the edges or put them next to each other

A．coincide
B．extend
C．overlap
D．collide
单项选择题
The disagreement over trade restrictions could seriously （）relations between the two countries.

A．tumble
B．jeopardize
C．manipulate
D．intimidate
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