can do all these tasks effortlessly . It’s very hard for us to put these abilities into our machines.”

　　The robotic vehicles, though with necessary modern equipment such as advanced computers and GPS guidance, had trouble figuring out fast enough the blocks ahead that a two-year-old human recognizes immediately, Sure, that very young child, who has just only learned to walk, may not think to wipe apple juice off her face, but she already knows that when there’s a cookie in the kitchen she has to climb up the table, and that when she gets to the cookie it will taste good. She is more advanced, even months old, than any machine humans have designed.

　　56．Watchers doubted if any of the vehicles could finish the race because ???????.

　　．the road was

　　the drivers

　　B．they did not have any human guidance

　　C．the distance was too long for the vehicles D．the prize money was unattractive to the drivers

　　．DARPA organized the race in order to ????????.

　　A．raise money for producing more robotic vehicles ．train more people to drive in the desert

　　．

　　D．improve the vehicles for future wars

　　．From the passage we know “robotic vehicles” are a kind of machines that ????????.

　　A．can do effortlessly whatever tasks living thing can

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