2012年5月19日晚，国务院 * * 温 * * 在武汉中国地质大学发表讲话，希望同学们在校学习的时候，就要树立远大理想，把今天的学习和今后的工作紧密结合在一起，练就本领，将来为人民更好地工作。温 * * 讲话涉及人生目的，而人生目的是人生观的核心，人生目的在人生实践中具有重要的作用。人生目的决定

A．人生道路

B．人生态度

C．世界观

D．人生价值标准

Believe it or not，optical illusion can cut highway crashes.
Japan is a case in point．It has reduced automobile crashes on some roads by Rearly 75 percent using a simple optical illusion．Butst．ripes,called chevrons(人字形)，painted on ther rads make drivers think that they are driving faster than they really are，and thus drivers slow down.
Now the American Automobile Association Foundation for Traffic Safety in Washington D．C. is planning t。repeat Japan’s success．Starting next year，the foundati。n will paint cheyrons and。ther pattems of stripes on selected roads around the country to test how well the patterns reduce highway erashes．
Excessive(too great)speed plays a major role in as much as one fifth of all fatal traffic accidents， according to the foundation．To help reduce those accidents，the foundation will conduct its tests in areas where speed-related hazards(danger)are the greatest curves，exit slopes，traffic circles，and bridges．
Some studies suggest that straight，horizontal bars painted across roads can initially cut the average speed of drivers in half．However,traffic。ften returns to full speed within months as driVers become used to seeing the painted bars．
Chevrons，scientists say，not only give drivers the impression that they are driving faster than they reallv are but als0 make a lane appear to be narrower．The result is a longer lasting reduction in highway speed and the number of traffic accidents．

The advantage of chevrons over straight, horizontal bars is that the former______.

A. can keep drivers awake

B. can cut road accidents in half
C. will look more attractive

D. will have a longer effect on drivers