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　　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．

　　The fact that aircraft may be vulnerable(易受攻击)to interference 　　19　　 the risk that terrorist may use radio system in order to 　　20　　 navigation equipment．

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　　A big tree in front of my house fell down in my yard due to the snowstorm last night．The mess that the 　　1　　 made-blocking the front door with its trunk, 　　2　　 my fence and handmade gate-was mostly buried in snow．Saturday was 　　3　　 so I went out to start 　　4　　 all the branches(树枝)and chunks of wood in my yard．

　　The more I collected, the more damage I 　　5　　．The walkway was messed up, the crocus shoots(番红花的嫩枝)I always looked forward 　　6　　 were crushed(压碎), and my butterfly bush was 　　7　　．I’d never get my yard back to the 　　8　　 it had been and it looked like a trash heap(垃圾堆)．Seeing all these, I became 　　9　　．

　　　　10　　 I saw a silver thing in the soft soil．“Was it a battery?” I 　　11　　．I turned it over and saw a small blue pattern．It was the 　　12　　 “E” from my daughter Evie’s bracelet(手镯)！She’d be so 　　13　　 to see it again! The bracelet was a 　　14　　 for her birthday．She’d 　　15　　 it for exactly two hours 　　16　　 losing the first of the four magnetic letters that 　　17　　 her name．She hadn’t worn it since．How could she? Her name was not “vie”．

　　I ran inside 　　18　　 between my fingers what seemed like a little miracle．“Evie!” I called．“Come and see．” It was then that I 　　19　　 understood the meaning of thanksgiving．After all, although the tree fell, it 　　20　　 my house．How lucky I was!

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　　Chinese swimmer Xiong Guoming made a record at the 1993 Asian Games in Japan, but was punished for taking banned medicine．His record was 　　1　　 and he was not 　　2　　 to take part in any other competitions for two years．

　　It was a great 　　3　　 and 　　4　　 for Xiong, one of the best-known swimmers in the world．This bad news harmed the fame of the Chinese swimming team, and resulted 　　5　　 in all Chinese records in swimming．However, the so-called banned medicine was, in fact, 　　6　　 traditional Chinese health food．

　　It may have been 　　7　　 to Xiong, as he had no 　　8　　 of some of the banned chemical elements in the health food．The failure was a sudden blow to him．He became very disappointed．　　9　　 only 20 years old, he 　　10　　 the life style of a retired man, passing his time in doing such things as keeping pets and growing flowers．Day after day, he was worried and displeased．

　　Back to the training pool was all the more difficult to him．To other people, it was just a 　　11　　 of getting prepared for a competition, but to him, it was to rebuild self-confidence first．He did not lose heart, after all．　　12　　 advice and help of his coach and leaders of the swimming team, Xiong decided to 　　13　　 swimming again as his career．

　　　　14　　 expected, Xiong took first place again．In the recent Eighth National Games, he took a number of titles, and broke an Asian record．Tears ran down his cheeks as he was receiving the gold medals．In the thundering applauses(鼓掌欢迎)Xiong felt as if he had been given a new birth．“I want to 　　15　　 the world that I am a good swimmer, and that I do not cheat anyone 　　16　　．My 　　17　　 depends upon my sweat,”Xiong said．He also 　　18　　 thankful to those who had helped and cared for him when he was 　　19　　．

　　Xiong, the young swimmer with a brighter future, is well 　　20　　 his way to the coming Olympic Games．