85. The writer thought that _______.
A. the Kennedy family was the best choice of the American people
B. the brothers had the greatest
chance of becoming president of the
C. besides the Kennedy brothers, many other people had great ability in politics.
D. the Kennedy story was built not on fact but on the family name.
E
Believe it or not, optical illusion(视觉错觉) cut high way accidents.
Now the American Automobile Association
Foundation for Traffic Safety in Washington D.C is planning to repeat
Over speeding 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 dangers are the greatest---curves, exit slopes, traffic circles, and bridges.
Some studies suggest that straight, horizontal(平行的) bars painted across roads can initially cut the average speed of drivers in half. However, traffic often 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 really are, but also make a lane(车道) appear to be narrower. The result is a longer lasting reduction(减少) in highway speed and the number of traffic accidents.