Although nicotine is probably the well-known chemical in cigarettes, it is not necessarily the one that changes the psyche of th

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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.
According to the passage, a cigarette can raise a smoker’s heart rate by ______ a minute.

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答案10-20 beats

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