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
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