完型填空

阅读下面短文，掌握其大意，然后从各题所给的四个选项中选出一个最佳答案。

　　When Liu Kaiqu was young he was poor in Shanghai．One day he 　　1　　 a picture of a tiger and tried to sell it on the street．It caught the 　　2　　 of an American, who asked, “How much does it cost?” He said, “500 dollars．” The foreigner thought it was too 　　3　　 and asked again, “Can you make it cheaper?” He answered, “No,” Then he tore(撕)it to pieces．In great 　　4　　,the foreigner said, “Young man, are you 　　5　　?” “No, sir．I'm not angry．I sold it 　　6　　 500 dollars because I thought it was worth the 　　7　　　．But you wanted a 　　8　　 price．It means you didn't think 　　9　　 and it is not good enough．I'll go on 　　10　　 until my customers are satisfied．” At that time, 　　11　　 Liu Kaiqu was not famous at all, he never 　　12　　 his dream．Now he is well－known all over the world as a great artist．

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　　Imagine playing a board game with your mom as she drives you to school．Wait! Shouldn’t your mom keep her hands on the wheel and her eyes on the road? Not if she’s driving a computer-controlled car down a high-tech highway of the future．

　　Someday, moms may be able to do it．In 1997, scientists and engineers tested new computer-controlled cars that drove themselves along a special high-tech highway called a “smartway”．Computers in the cars used information from magnets(磁铁), light sensors, and radar detectors built into the smartway．

　　Scientists hope that drivers of the future will simply drive up to a smartway, then switch on the car’s automated(自动的)driver．The human driver will sit back and enjoy the ride．A computer system will do the rest．Satellites and magnets will help instruct the car along the highway．Sensors will make the car drivers know other cars nearby．The car’s central computer will process information and instruct the car what to do．For example, if a car is too close to the car in front of it, the computer will tell it to slow down or change lanes．When the car’s human driver decides to exit the smartway, he or she will take over the controls and return to the regular highway．

　　Engineers hope the smartways will save time for commuters and cut down the number of car accidents and traffic jams．Most accidents are caused by human error, according to the U．S．Department to Transportation．Computer-controlled cars should eliminate(消除)those kinds of accidents because a computer, not a human, will decide what the car will do next．

　　But some car makers aren’t sure the smartway will be the safest way to travel．What would happen if a deer jumped into the road? Or if the car’s computer broke down? Engineers are trying to answer these questions now．

　　Until they find the answers, your mom will have to keep her eyes on the road．

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