单项选择题


A．contrast
B．chance
C．turns
D．itself
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A．intoB．toC．aboutD．as
A．into
B．to
C．about
D．as
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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