Ⅱ.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(干擾). 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__take­off 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(禁止)passengers from__11__such equipment during take­off 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(易受攻擊)to interference__19__the risk that terrorist may use radio system in order to__20__navigation equipment.

　　1.A.drivers B.pilots

　　C.engineers D.conductors

　　答案：B　文章第一句已表明：當(dāng)今航空公司面對(duì)的最大的安全威脅不是持槍的恐怖分子，而是手提電腦。所以對(duì)飛機(jī)上的這種事情最了解的應(yīng)是飛行員，而不是A、C、D的那些人。

　　2.A.actions B.events

　　C.matters D.incidents

　　答案：D　此處指飛機(jī)上發(fā)生的這類事情。本題同樣考查了詞義辨析。incident指“較小的事件，插曲，小故事”，action是“(采取的)行動(dòng)”之意，event是“大事件”，matter指“問題，事情，或麻煩事”等，均不合適。

　　3.A.reason B.effect

　　C.source D.story

　　答案：C　根據(jù)下句話得知“手提電腦，移動(dòng)電話”等這些電子裝置應(yīng)是“干擾源”，而不是受干擾的結(jié)果，受干擾的應(yīng)當(dāng)是飛機(jī)。reason不合適是因?yàn)閞eason接for而不接of，表示“……的原因”。

　　4.A.and B.for

　　C.but D.so

　　答案：C　“沒有確認(rèn)”(unconfirmed)與“在增加”(increasing)中間應(yīng)是轉(zhuǎn)折關(guān)系，不是遞進(jìn)、因果關(guān)系，所以不選A、B、D。

　　5.A.advises B.persuades

　　C.ensures D.warns

　　答案：A　因?yàn)橄挛挠昧藃ecommend(勸告)一詞，所以這個(gè)組織應(yīng)該是向航空工業(yè)提建議的一個(gè)組織，這樣才前后一致。