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  3. Although nicotine is probably the well-known chemical in cigarettes, it is not n

Although nicotine is probably the well-known chemical in cigarettes, it is not n

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问题 Although nicotine is probably the well-known chemical in cigarettes, it is not necessarily the one that changes the psyche of the smoker when cigarettes are smoked. [br] In order to transmit nerve impulses to its neighbor, a neurone sends ______ known as neuron-transmitters.
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答案 chemical messengers
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