选D
the加单数可数名词=可数名词复数 表示一类
a popular means一种流行的（交通）方法.means是手段、方法的意思,单复数同形,跟mean没有关系,不是mean加了复数.means是可数的,一种流行的方法,泛指,需要加不定冠词a.
In China,___ bicycle is____ popular means of transportation.
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