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．Regular driver training.B．Improved highway design.C．Stricter traffic regulations.D．Better public transportation.
A．Regular driver training.
B．Improved highway design.
C．Stricter traffic regulations.
D．Better public transportation.
单项选择题
A．Tent campers have a simple life.B．Campers get a chance to relax.C．Campers in tents have the same conveniences as those in trailers.D．The national parks are favorite camping places.
A．Tent campers have a simple life.
B．Campers get a chance to relax.
C．Campers in tents have the same conveniences as those in trailers.
D．The national parks are favorite camping places.
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