单项选择题

The U.S. government places rigid restrictions ______ the type of high-technology products that can be exported to China.

A．for
B．in
C．to
D．on

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单项选择题

If people feel hopeless, they don't bother to ______ the skills they need to succeed.

A．adopt
B．acquire
C．accumulate
D．assemble

单项选择题

We find it extremely difficult to ______ the meaning of what he has just said.

A．get into
B．get over
C．get across
D．get at

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