Test 15

　　Ⅰ.完形填空

　　The biggest safety threat facing airlines today may not be a terrorist with a gun，but the man with the portable computer in business class.In the past 15 years，__1__ have reported well over 100 __2__ that could have been caused by electromagnetic interference.The __3__ of this interference remains unconfirmed，__4__ increasingly，experts are pointing the blame at portable electronic devices such as portable computers，radios and cassette players and mobile telephones.

　　RTCA，an organization which __5__ the aviation industry，has recommended that __6__ airlines ban such electronic devices from being used __7__“critical” stages of flight，__8__ take-off and landing.Some experts have gone further，__9__ for a total ban during all flights.Currently，rules on using these devices are __10__ up to individual airlines.And although some airlines prohibit passengers from__11__ such equipment during take-off and landing，most are reluctant to enforce a total ban.Many passengers want to work during flights.

　　The __12__ is predicting how electromagnetic fields__13__ affect an aircraft’s computers.Experts __14__ that portable devices emit radiation，which affects those wavelengths which__15___use for navigation and communication.But，they have not been able to __16__these effects in a laboratory，they have no__17__of knowing whether the interference might be __18__ or not.

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