Thebiggestsafetythreatfacingairlinestodaymaynotbeamanwi...

问题详情：

The biggest safety threat facing airlines today may not be a man with a gun But the man with the portable computer in business class. In the last 25 years, pilots have reported well over 200 incidents that (25) __________ have been caused by electromagnetic interference. Unclear (26)______________ the source of this interference remains, increasingly, experts have found out that portable electronic devices such as portable computers, radio and mobile telephones are (27)_____________(blame).

RTCA, an organization which advises aviation industry, has suggested that all airlines ban such devices from (28) _____________(use) during “key” stages of flight, particularly take-off and landing. Some experts have gone (29)______________ (far), calling for a total ban during all flights. Nowadays, rules on using these devices are left up to airlines. And although some airlines ban passengers from using such equipment during take-off and landing, most are not willing to enforce a total ban, if many passengers want to work during flights.

The difficulty is understanding (30)_____________ electromagnetic fields might affect an aircraft's computers. Experts know that the portable devices give off radiation, each (31) ______________(affect) those wavelengths which aircrafts use for 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 in trouble because of the interference raises the risk (32)____________some people may use radio systems in order to damage navigation(*) equipment. As worrying, though, is the passenger who can't hear the instructions to turn off his radio because the music's too loud.

【回答】

25. could / may / might  26. as  27. to blame  28. being used  29. further  30. how

31. affecting  32. that 

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