________.

　　A.children don't really have freedom at college

　　B.social media make our life much easier than before

　　C.today's parents contact their children more frequently

　　D.parents shouldn't follow their children at college through social media

　　B

　　People in several American states may be surprised to see cars on city streets without a driver. Experimental driverless vehicles now are legal in Florida, Nevada and California. They are pointing the way to a future that is not far down the road. The high

　　tech company Google has a number of self­driving cars, which had covered 480,000 kilometers by August. Volvo is among the companies doing road tests and says it plans to sell driverless cars by 2020.

　　In September, California Governor Jerry Brown signed an act to allow autonomous vehicles on the roads of his state. “Today we're looking at science fiction becoming tomorrow's reality — the driverless car.” The technology for these cars includes cameras, radar and motion sensors. The systems have been improved through competitions sponsored by the U. S. government agency DARPA. Engineer Richard Mason of the Rand Corporation helped design driverless vehicles for DARPA challenge races.

　　Cars have become much more fuel­efficient, and new electronic features are

　　making Hondas safer, said Angie Nucci of Honda America.

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