单项选择题

Metals, valued by weight, ______ coins in many parts of the world.

A．preceded
B．perceived
C．performed
D．precipitated
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单项选择题
Because of the economic slump, there are only ______ on the beach as before.
A．one-fifth tourists as many
B．one-fifth as many tourists
C．tourists one-fifth as many
D．tourists as one-fifth many
单项选择题
The new policy may have protected the new city from being polluted as well as the life of its residents ______.
A．affected
B．affecting
C．is affected
D．having affected
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