问题
选择题
Sam some knowledge of the computer just by watching others working on it．
A．brought up
B．looked up
C．picked up
D．set up
答案
答案：C
考查固定短语。brought up抚养长大；．looked up查找，检查；picked up拾起，捡起，偶然学会；set up设立，建立。Sam通过看别人操作学会了一些电脑知识。所以选C。