填空题

Virtual Driver
Driving involves sharp eyes and keen ears, analyzing with a brain, and coordination between hands, feet and brain. A man has sharp eyes and keen ears,analyzes through his brain, and maintains coordination between his hands and brains. He can control a fast-moving cat with different parts of his body. (46) Apparently there isn’t anyone in the driver’s cab, but there is in fact a virtual driver. This virtual driver has eyes,brains,hands and feet too. The minicameras on each side of the car are its eyes and are responsible for observing the road conditions ahead of it as well as the traffic to its left and fight. If you open the boot,you can see the most important part of the automatic driving system:a built-in computer. (47) The brain of the car is responsible for calculating the speeds objects surrounding the car are moving at analyzing their position on the road, choosing the fight path, and giving orders to the wheel and the control system.
In comparison with the human brain, the virtual driver’s best advantage is that it reacts quickly. (48) However, it takes the world’s best racecar driver at least one second to react, and this doesn’t include the time he needs to take action.
With its rapid reaction and accurate control, the virtual driver can reduce the accident rate on expressways considerably. In this case,is it possible for us to let it have the wheel at any time and in any place (49) With its limited ability to recognize things, the car can now only travel on expressways.
The intelligent car determines its direction by the clear lines that mark the lanes clearly and recognizes vehicles according to their regular shapes. (50) This being the case, people still have high hopes about driverless cars, and think highly intelligent cars are what the cars of the future should be like.
A.Experts say that we cannot do that just yet.
B.In the near future,intelligent cars will be put into commercial operation.
C.This is the brain of the car.
D.But how does an intelligent car control itself
E It completes the processing of the images sent by the cameras within 100 milliseconds.
F However, it cannot recognize moving people and bicycles on ordinary roads that have no clear markings on them.

【参考答案】

F
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A. to B. with C. by D. in
American public education has changed in recant years. One change is that increasing numbers of American parents and teachers are starting independent public schools (51) charter schools (特许学校).
In 1991, there were no charter schools in the United States. Today, more than 2,300 charter schools (52) in 34 states and the District of Columbia. 575,000 students (53) these schools. The students are from 5 years of age through 18 or older.A charter school is (54) by groups of parents, teachers and community (社区) members. It is similar in some ways (55) a traditional public school. It receives tax money to operate just as other public schools do. The (56) it receives depends on the number of students. The charter school must prove to local or state governments that its students are learning. These governments (57) the school with the agreement, or charter that permits it to operate.
Unlike a traditional public school, (58) , the charter school does not have to obey most laws governing public schools. Local, state or federal governments cannot tell it what to (59) .
Each school can choose its own goals and decide the ways it wants to (60) those goals. Class sizes usually are smaller than in many traditional public schools. Many students and parents say (61) in charter schools can be more creative.
However, state education agencies, local education-governing committees and unions often (62) charter schools. They say these schools may receive money badly (63) by traditional public schools. Experts say some charter schools are doing well while others are struggling.
Congress provided 200 million dollars for (64) charter schools in the 2002 federal budget (预算). But, often the schools say they lack enough money for their (65) . Many also lack needed space.