填空题

In order to transmit nerve impulses to its neighbour, a neurone sends ______ known as neurotransmitters.

【参考答案】

chemical messengers
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单项选择题
A．The room is stuffy.B．The windows are closed.C．Too many people are smoking.D．She isn’t feeling well.
A．The room is stuffy.
B．The windows are closed.
C．Too many people are smoking.
D．She isn’t feeling well.
填空题
According to the passage, a cigarette can raise a smoker’s heart rate by ______ a minute.
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