An intelligent car

Driving needs sharp eyes, keen ears, quick brain, and coordination 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 driver in the smart car. This virtual driver has “eyes,”“brains”，“hands” and “feet”，too. The mini-cameras (52)each side of the car are his “eyes,” which observe the road and conditions ahead of it. They watch the (53)to the car’s left and right. There is also a highly (54)driving system in the car. It is the built-in computer, which is the virtual driver’s “brain. ” His “brain” calculates the speeds of (55)moving cars near it and analyzes their positions. Basing on this information, it chooses the right (56)for the intelligent cars, and gives (57)to the “hands”and “feets”to act accordingly. In this way, the virtual driver controls his car.

What is the virtual driver’s best advantage? He reacts (58).The mini-cameras are (59)images continuously to the “brain”. It (60)the processing of the images within 100 milliseconds. However, the world’s best drier (61)needs one second to react. (62),when he takes action, he needs one more second.

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

練習：

51.A.these B.them C.this D.that

52.A.within B.above C.to D.on

53.A.police B.traffic C.trucks D.buses

54.A.mechanical B.moveable C.automatic D.electronic

55.A.another B.other C.each other D.one another

56.A.line B.lane C.track D.path

57.A.space B.locations C.instructions D.time

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

59.A.bringing B.taking C.sending D.carrying

60.A.selects B.completes C.uses D.tests

61.A.at least B.at most C.at last D.at best

62.A.So B.However C.Besides D.Therefore

63.A.count B.amount C.digit D.rate

64.A.warn B.suggest C.invite D.check

65.A.unknown B.few C.untested D.limited

答案：ADBCB DCACB ACDAD

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