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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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