单项选择题

New vehicles must ______ with certain standards for environmental protection.

A．apply
B．comply
C．imply
D．supply
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单项选择题
The disagreement over the trade restrictions could seriously ______ relations between the two countries.
A．tumble
B．manipulate
C．jeopardize
D．intimidate
单项选择题
My sister is quite ______ and plans to get a Ph. D. in the future.
A．aggressive
B．ambitious
C．considerate
D．enthusiastic
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