单项选择题

The expression "air time" in the last paragraph probably has the similar meaning of ______.

A．the broadcasting time on TV
B．time spent on a conversation
C．time spent on a specific topic
D．the chance to make responses
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单项选择题
The author's wife's words mean that sometimes he ______.
A．overhears other people's conversations
B．may enter a cafeteria for lunch
C．awaits patiently his chance to respond
D．does not really listen to other's statements
单项选择题
According to the passage, misdiagnosis ______.
A．has become a rare thing
B．takes up 20 percent of the diagnosis of deadly diseases
C．has aroused much attention
D．started since the 1930's
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