单项选择题

At present much more stress has been laid ______ law and order by the local government.

A．onto
B．at
C．on
D．to
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单项选择题
If we fail to act now, said Tom, we'll find ourselves ______ this later on.
A．pay back
B．pay for
C．pay up
D．pay off
单项选择题
For some serious coin collectors, a coin with a different date, mintmark, and even a little ______ in design is counted as a different coin.
A．contrast
B．diversity
C．variation
D．variety
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