【题目】Mary ________ a lot of Japanese by communicating with the native people in Japan.
A．picked outB．picked upC．carried outD．made up
在线课程【答案】B
【解析】
试题分析：A．picked out挑出，选出；B．picked up不费力气地学会；C．carried out执行，实施；D．made up组成，化妆。句意：Mary通过和日本本地人交流不费力气地学会了许多日语。B项符合语境。