职称英语考试理工类完形填空备考必备提高练习(7)

　　Driving needs sharp eyes, keen ears, quick brain, and coordination between hands and the brain. Many human drivers have all ____1____ and can control a fast-moving car. But how does an intelligent car control itself?

　　There is a virtual drive1 in the smart car. This virtual driver1 has eyes, brains, hands and feet, too. The minicameras ____2____ each side of the car are his eyes, which observe the road conditions ahead of it. They watch the ____3____ to the cars left and right. There is also a highly ____4____ driving system in the car. It is the built-in computer, which is the virtual drivers brain. His brain calculates the speeds of ____5____ moving cars near it and analyzes their positions. Basing on this information2, it chooses the right ____6____ for the intelligent car, and gives ____7____ to the hands and feet to act accordingly. In this way, the virtual driver controls his car.

　　What is the virtual drivers best advantage3? He reacts ____8____. The minicameras are ____9____ images continuously to the brain. It ____10____ the processing of the images within 100 milliseconds. However, the worlds best driver ____11____ needs one second to react. ____12____, when he takes action, he needs one more second.

　　The virtual driver is really wonderful. He can reduce the accident ____13____ considerably on expressways. In this case, can we let him have the wheel4 at any time and in any place? Experts ____14____ what we cannot do that5 just yet6. His ability to recognize things is still ____15____. He can now only drive an intelligent car on expressways.

　　1.A) these B) them C) this D) that

　　2.A) within B) above C) to D) on

　　3.A) police B) traffic C) trucks D) buses

　　4.A) mechanical B) movable C) automatic D) electronic

　　5.A) another B) other C) each other D) one another

　　6.A) line B) lane C) track D) path

　　7.A) space B) locations C) instructions D) time

　　8.A) quickly B) cleverly C) virtually D) safely

　　9.A) bringing B) taking C) sending D) carrying

　　10.A) selects B) completes C) uses D) tests

　　11.A) at least B) at most C) at last D) at best

　　12.A) So B) However C) Besides D) Therefore

　　13.A) count B) amount C) digit D) rate

　　14.A) warn B) suggest C) invite D) check

　　15.A) unknown B) few C) untested D) limited