单项选择题

A．Improved highway design.
B．Better public transportation.
C．Regular driver training.
D．Stricter traffic regulations.
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单项选择题
A．The causes are familiar.B．The causes are not well understood.C．The causes are obvious.D．The causes are very complicated.
A．The causes are familiar.
B．The causes are not well understood.
C．The causes are obvious.
D．The causes are very complicated.
单项选择题
A．They set off early.B．They wait for a fine day.C．They go sightseeing.D．They go to the seaside.
A．They set off early.
B．They wait for a fine day.
C．They go sightseeing.
D．They go to the seaside.
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