25. A fuel that bums cleanly.

　　An oil additive that helps cool engines.

　　A material from which filters are made.

　　An insulating material sprayed on engine parts.

　　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 aircrafts 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.

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