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.What does the author say about straight, horizontal bars painted across roads?
A) They are falling out of use in the United States .
B) They tend to be ignored by drivers in a short period of time.
C) They are applicable only on broad roads.
D) They cannot be applied successfully to traffic circles.
A) They are falling out of use in the United States .
B) They tend to be ignored by drivers in a short period of time.
C) They are applicable only on broad roads.
D) They cannot be applied successfully to traffic circles.
参考答案