单项选择题

A．C ) A suburban one.
B．An affluent one.
C．A poor one.
D．A rural one.
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单项选择题
A．He can’t find his office key.B．He has misplaced some exams.C．He is unable to talk.D．He doesn’t like his classroom.
A．He can’t find his office key.
B．He has misplaced some exams.
C．He is unable to talk.
D．He doesn’t like his classroom.
填空题
In order to transmit nerve impulses to its neighbour, a neurone sends ______ known as neurotransmitters.
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