The fact that aircraft may be vulnerable(易受损的)to interference raises the risk that terrorists may use radio systems in order to damage navigation 9 . As worrying, though, is the passenger who cant hear the instructions to turn off his radio because the musics too 10 .

　　A)definite

　　B)incidents

　　C)effects

　　D)remains

　　E)critical

　　F)particularly

　　G)reluctant

　　H)refreshing

　　I)portable

　　J)enormous

　　K)predicting

　　L)liberal

　　M)affects

　　N)equipment

　　O)loud

　　四、改错

　　Most people work to earn a living and they

　　produce goods and services. Goods are either

　　agricultural or manufactured . Services are such things like education, 1._________

　　medicine, and commerce. These people provide 2.__________

　　goods; some provide services. Other people provide

　　both goods or services. For example, in the same 3.__________

　　garage a man may buy a car or some service which

　　helps him maintain his car.

　　The work people do is called as economic 4.__________

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