单项选择题

A global firm’s profits can __ dramatically depending on the strength of its home currency and the currencies of the countries in which it operates.

A．vary
B．change
C．alter
D．convert
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单项选择题
Love can __ imperfection.
A．resist
B．sustain
C．undergo
D．tolerate
单项选择题
Methanol-fueled vehicles would __ an immediate lessening of urban air pollution.
A．attribute to
B．attend to
C．contribute to
D．devote to
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