单项选择题

It is useful to be able to predict the extent （）which a price change will affect supply and demand.

A. from
B. with
C. to
D. for

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单项选择题

He hoped the firm would （）him to the Paris branch.

A. exchange
B. transmit
C. transfer
D. remove

单项选择题

However, at times this balance in nature is （）, resulting in a number of possibly unforeseen effects.

A. troubled
B. disturbed
C. confused
D. puzzled

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