ker 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.
三、选词填空
The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the (1) computer in business class. In the last 15 years, pilots have reported well over 100 (2) that could have been caused by electromagnetic interference. The source of this interference (3) unconfirmed, but increasingly, experts are pointing the blame at portable electronic device such as portable computers, radio and cassette players and mobile telephones.
RTCA, an organization which advises the aviation（航空）industry, has recommended that all airlines ban
（禁 止）such devices from being used during (4 ) stages of flight, (5) take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are (6) to enforce a total ban, given that many passengers want to work during flights.
The difficulty is (7) how electromagnetic fields might affect an aircraft’s computers. Experts know that portable device emit radiation which (8) those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be vulnerable（易受损的）to interference raises the risk that terrorists may use radio systems in order to damage navigation (9) . As worrying, though, is the passenger who can’t hear the instructions to turn off his radio because the music’s too (10) .
词语选项：
A、definite B、incidents C、effects D、remains E、critical
F、particularly G、reluctant H、refreshing I、portable J、enormous
K、predicting L、liberal M、affects N、equipment O、loud
责任编辑:yechenglu
