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  3. Believe it or not, optical illusion can cut highway crashes. Japan is case in point. It has reduced automobile crashes on 【M1

Believe it or not, optical illusion can cut highway crashes. Japan is case in point. It has reduced automobile crashes on 【M1

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问题   Believe it or not, optical illusion can cut highway crashes.
  Japan is case in point. It has reduced automobile crashes on  【M1】______.
some roads by nearly 75 percent using a simple optical illusion.
Bending stripes, called chevrons (人字形), painted on the roads make 【M2】______.
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 to repeat Japan’s success. Starting
next year, the foundation will paint chevrons and other patterns of stripes
on selected roads around the country to test how the patterns reduce 【M3】______.
highway crashes.
Excess speed plays a major role in as much as one fifth of all   【M4】______.
fatal traffic accidents, according to the foundation. To help reduce those
accidents, the foundation will conduct its tests in areas which speed-related 【M5】______.
hazards are the greatest -- curves, exit slopes, traffic circles, bridges.   【M6】______.
  Some studies suggest that straight, horizontal bars painted across
roads can initially cut the average speed of drivers in half. Then,  【M7】______.
traffic often returns to fast speed within months as drivers become used to  【M8】______.
seeing the painted bars.
  Chevrons, scientists say, not only give drivers the impression 【M9】______.
they are driving faster than they really are but also make a lane appears to 【M10】______.
be narrower. The result is a longer lasting reduction in highway speed
and the number of traffic accidents.
【M5】
选项
答案which改成where
解析 句法错误，从句连接词误用。此处是定语从句，从句缺少状语；先行词是areas，故从句缺少的是地点状语，所以应使用关系副词where。
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