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单选题
It is implied in the passage that _____.
A
people should not take street level transportation
B
tiny iron particles will not cause health problems
C
air pollution on an underground train is less poisonous
D
traveling on an underground train is better than taking the bus
参考答案
参考解析
解析：
第三段第四句：地铁车厢里的空气污染通常比地面街道上的毒性小些，因为地铁里的污染物大多是由车轮与铁轨摩擦产生的铁的微粒组成的。
第三段第四句：地铁车厢里的空气污染通常比地面街道上的毒性小些，因为地铁里的污染物大多是由车轮与铁轨摩擦产生的铁的微粒组成的。
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