单项选择题

The first stated aim of the U.N. was ______.

A．to supervise peace and treaties
B．to revise international laws
C．to prevent a third world war
D．to assist the "third world" countries
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单项选择题
Under its chapter, the U.N. guarantees ______.
A．never to use arms
B．to employ international machines
C．to better standards of life
D．to promote economic and social advancement
单项选择题
A country's domestic policies ______.
A．can not be forcibly changed by the U. N.
B．are often investigated by the U. N.
C．are often enforced by the U. N.
D．are not allowed to benefit from U.N. advice or assistance
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