Driving needs sharp eyes,keen ears,quick brain,and coordination(協調)between hands and the brain.Many human drivers have all(51)and can control a fast-moving car.But how does an intelligent car control itself?

　　There is a virtual(虛擬的)driver in the smart car.This virtual driver has"eyes,""brains,""hands"and"feet,"too.The minicameras(52)each side of the car are his"eyes,"which(53)the road conditions ahead of it.They watch the(54)to the car's left and right.There is also a highly automatic driving(55)in the car.It is the built-in computer,which is the virtual driver's"brain."His"brain"(56)the speeds of other moving cars near it and analyzes their positions.Basing on this information,it chooses the(57)path for the intelligent car,and gives instructions to the "hands"and"feet"to act accordingly.In this way,the virtual driver(58)his car.

　　What is the virtual driver's best advantage?He reacts(59).The minicameras are bringing(60)continuously to the "brain."It completes the processing of the images within 100 milliseconds.(61),the world's best driver needs at least one second to react.Besides,when he takes(62),he needs one more second.

　　The virtual driver is really wonderful.He can reduce the accident(63)considerably on expressways(高速公路).In this(64),can we let him have the wheel at any time and in any place?Experts(65)that we cannot do that just yet.His ability to recognize things is still limited.He can now only drive an intelligent car on expressways.

　　51.A.these　B.them　C.this　D.that

　　52.A.in　B.above　C.to　D.on

　　53.A.change　B.observe　C.improve　D.meet

　　54.A.police　B.traffic　C.pets　D.trees

　　55.A.button　B.door　C.system　D.activity

　　56.A.calculates　B.reaches　C.gathers　D.reduces

　　57.A.different　B.narrow　C.same　D.right

　　58.A.stops　B.finds　C.controls　D.selects

　　59.A.quickly　B.cleverly　C.virtually　D.safely

　　60.A.ideas　B.news　C.memory　D.images

　　61.A.so　B.However　C.Besides　D.Therefore

　　62.A.action　B.role　C.decision　D.notice

　　63.A.investigation　B.prevention　C.rate　D.report

　　64.A.case　B.method　C.manner　D.file

　　65.A.expose　B.warn　C.hope　D.wish

　　參考答案:

　　51.A　　52.D　　53.B　　54.B　　55.C

　　56.A　　57.D　　58.C　　59.A　　60.D

　　61.B　　62.A　　63.C　　64.A　　65.B

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