单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．The room is stuffy.
B．Too many people are smoking.
C．The windows are closed.
D．She isn’t feeling well.

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填空题

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

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

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。