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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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
单项选择题
According to the passage, electric response audiometry can be used _________.
A．whether a person is awake or asleep
B．only if a person is relaxed
C．particularly if a person hears a loud noise
D．particularly when a person is dreaming
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