题干
（山东卷27）. Sam ___ some knowledge of the computer just by watching others working on it.
A：brought u
B：looked u
C：picked u
D：set u
答案(点此获取答案解析）
C
A：brought u
B：looked u
C：picked u
D：set u
的导函数
的图像如图所示，则
的解析式可能是（ ）