Loading & Passengers第 15 / 80 题
Hazardous materials that riders sometimes try to carry aboard a bus are a concern because:
a.They make the bus heavier
b.They are always clearly labeled
c.They may be brought on without any warning label
d.They improve traction
解析
Riders may unknowingly or intentionally bring hazardous materials such as car batteries or gasoline aboard without proper labels. Watch for leaking, smelly, or unlabeled containers. If you are unsure whether something is allowed, do not let it on the bus.
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