1The biggest safety threat facing airlines today may not be a(n) 1 with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have 2 well over 100 incidents that could 3 by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the 4 at portable electronic 5 such as portable computers, radio and cassette players and mobile telephones.RTCA, an organization which advises the aviation industry, has 6 that all airlines ban such devices from 7 during “critical” stages of flight, particularly the takeoff and the landing. Some experts have gone 8, calling for a 9 ban during all flights. 10, rules on using these devices are left up to individual airlines. And although some airlines 11 passengers from using such equipment during taking off and landing, most are 12 to enforce a total ban, given that many passengers want to work during flights.The difficulty is 13 how electromagnetic fields might affect an aircrafts 14. Experts know that portable devices emit radiation which 15 those wavelengths which aircraft use for navigation and 16. But, 17 they have not been able to 18 these effects in a laboratory, they have 19 of knowing whether the 20 might be dangerous or not.
英语悦读 Distributing chewing gum to the passengers, the stewardess explained it was to keep their ears from popping. When the plane landed, one of the passengers rushed up to her and said, “Im meeting my wife right away. How do I get the gum out from my ears?” 当空中小姐给乘客们发口香糖的时候，她解释说口香糖有助于他们防止耳鸣。飞机着陆后，一位乘客跑到这位空中小姐面前，说道：“ 我马上就要见到我妻子了。我怎么才能把口香糖从耳朵里面取出来呢？”
1. A.enemyB.birdC.terroristD.fighter 2. A.reportedB.foundC.heardD.seen 3. A.causeB.be caused C.being causedD.have been caused 4. A.mistakeB.blameC.reasonD.brief 5. A.toolsB.devicesC.watchesD.radios 6. A.recommendedB.told C.announcedD.declared 7. A.useB.usedC.being usedD.have used 8. A.farB.furtherC.nearD.nearer 9. A.halfB.suddenC.finalD.total 10. A.NewlyB.EspeciallyC.CurrentlyD.Particularly 11. A.stopB.exhibitC.prohibitD.suggest 12. A.willingB.pleasedC.activeD.reluctant 13. A.predictingB.sufferingC.providingD.finishing 14. A.flightsB.computersC.pilotD.aviation 15. A.makesB.causesC.containsD.affects 16. A.flightsB.aviation C.communicationD.landing 17. A.as long asB.becauseC.afterD.ever since 18. A.produceB.reproduceC.useD.reuse 19. A.no wayB.no function C.every wayD.every function 20. A.connectionsB.computer C.interferenceD.performance
