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题目内容 (请给出正确答案)
单选题
A

Regular driver training.

B

Improved highway design.

C

Stricter traffic regulations.

D

Better public transportation.


参考答案

参考解析
解析:
细节题。录音提到“Improved design has helped to make highways much safer”,可见“Improved design”是比较成功的措施。故选B。
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