Questions 1 7

　　1. 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.

　　2. In spite of the difficulties, according to the text more than thirty-five million people a year give up smoking.

　　3. It has been shown that nicotine in cigarettes can improve peoples abilities to perform some actions more quickly.

　　4. Added ammonia in cigarettes allows smokers to inhale more nicotine.

　　5. Snorted substances reach the brain faster than injected substances.

　　6. Nicotine dilates the blood vessels that carry it around the body.

　　7. Nicotine molecules allow greater electrical charges to pass between neurones.

　　Questions 8 - 10

　　8. Cigarette companies would have to cut the nicotine content in cigarettes by _________ to prevent them from being addictive.

　　9. According to the passage, a cigarette can raise a smokers heart rate by _________ a minute.

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

　　二、长对话

　　Conversation 1

　　19. Two different types of bones in the human body.

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