Bob a lot of Japanese when he watched Japanese cartoons at a younger age.
A. picked up
B. took up
C. made up
D. turned up
网友回答
(答案→)A. picked up
B. took up
C. made up
D. turned up
解析：考查短语辨析。A无意中学到；B从事；C组成；D出现。句意：微信，一种新的流行的社交网络应用，尤其受到大多年轻手机使用者的欢迎。故A正确。