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

单项选择题

According to the passage, testing team at the University of Iowa is the first to _____.

A．develop a method to test hearing by way of the brain
B．determine the extent of brain damage in hearing-impaired persons
C．observe the reaction of the brain to a laboratory-controlled noise
D．study all the parts of brain－wave responses at the same time