单项选择题

Besides its main use the noise-killing system can______.

A．make a car lighter
B．make a car quieter
C．reduce the cost of a silencer
D．improve the performance of a silencer
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单项选择题
The first stated aim of U. N. was______.
A．to watch and direct peace treaties
B．to revise international law
C．to prevent a third world war
D．to assist the developing countries
单项选择题
A member country cannot ally (结盟) itself with ______.
A．other U. N. member countries
B．other countries not members of the U. N.
C．countries resisting openly the U. N.
D．states against which the U.N. has ever taken preventive or enforcement action
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