单项选择题

A．They are marked with colored labels.
B．They are specially ceded.
C．They are checked out.
D．They are inspected by tile guard.
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单项选择题
A．Designing better ears.B．Building more highways.C．Increasing people’s awareness of traffic problems.D．Enhancing drivers’ sense of responsibility.
A．Designing better ears.
B．Building more highways.
C．Increasing people’s awareness of traffic problems.
D．Enhancing drivers’ sense of responsibility.
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