The passage mainly discusses ________. A) a new way of highway speed control B) a new pattern for painting highways C) a new approach to training drivers D) a new type of optical illusion 【外语教育&

The passage mainly discusses ________.
A) a new way of highway speed control
B) a new pattern for painting highways
C) a new approach to training drivers
D) a new type of optical illusion 【外语教育&

出自：河南师范大学-小学教育（本科)-大学英语Ⅱ

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