China Mobile has to face the problem that more and more people in China prefer to choose

问题补充：

China Mobile has to face the problem that more and more people in China prefer to choose cheaper wireless phone service known as “Little Smart”.

A. a; the

B. a; 不填

C. the; 不填

D. the; the

答案：

A. a; the

(答案→)B. a; 不填

C. the; 不填

D. the; the

解析：考查冠词：第一空表“种类”，应用不定冠词，第二空Little Smart小灵通相当于专有名词，其前不用冠词。句意：中国移动不得不面对一个问题：越来越多的人选择一种廉价的无线电话服务小灵通。选B。