单项选择题

______ into step with this new consumer society, the managers of firms, shops, and corporation have to make a study of the market.

A．Falling
B．To fall
C．Having fallen
D．Fallen
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单项选择题
Metals, valued by weight, ______ coins in many parts of the world.
A．preceded
B．perceived
C．performed
D．precipitated
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
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