As is known, mobile phones make it possible for people to each other conveniently.
A. keep in touch with
B. get in touch
C. lose touch
D. be concerned
网友回答
(答案→)A. keep in touch with
B. get in touch
C. lose touch
D. be concerned
解析：本题的含义为众所周知，手机使人们彼此之间很方便保持联系，keep in touch with表示与某人保持联系的含义，故本题选A。