With the popularity of cell phone more and more people are addicted to it and do less an

问题补充：

With the popularity of cell phone, more and more people are addicted to it and do less and less face-to-face communication, which has become widespread concern.

A. the; a

B. \; \

C. the; \

D. a; the

答案：

(答案→)A. the; a

B. \; \

C. the; \

D. a; the

解析：考查冠词。句义：随着手机的流行，越老越多的人们沉溺于手机，面对面的交流越来越少，这已经成为了大家担心的问题。手机属于发明物，所以叫定冠词the，concern，名词，关心，担心，在此属于抽象名词具体化，要加a,所以A正确。