2. 外语
  3. To reduce car crash rate, many scientists are working hard to According to the second paragraph, most road accidents happen due

To reduce car crash rate, many scientists are working hard to According to the second paragraph, most road accidents happen due

admin2009-01-21  34
问题 To reduce car crash rate, many scientists are working hard to
According to the second paragraph, most road accidents happen due to
选项 A、heavy traffic.
B、human mistakes.
C、engine failure.
D、bad weather.
答案B
解析
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