In many places in China bicycle is still popular means of transportation.A. a；theB. /；aC

问题补充：

In many places in China， bicycle is still popular means of transportation.

A. a；the

B. /；a

C. the；a

D. the；the

答案：

A. a；the

B. /；a

(答案→)C. the；a

D. the；the

解析：第一空为类指，表自行车，用“the/a＋单数可数名词”或“可数名词复数”形式均可；第二空为泛指，表示一种工具，故用不定冠词a。

答案C