题干
Be friendly and you'll ________ well with others.
A：look at
B：get on
C：put on
D：pick up
答案(点此获取答案解析）
B
Be friendly and you'll ________ well with others.
A：look at
B：get on
C：put on
D：pick up
的图象如右图所示，则函数
的单调递减区间是( )