淘宝店铺装修中，页头背景编辑可选用（）方式完成。
A.系统默认
B.背景色
C.背景图
D.自定义
参考答案：B, C
—Look. What a nice garden!
—Yes, it _____ every day. [ ]
A. cleans
B. was cleaned
C. is cleaned
D. has been cleaned
精加工余量一般为（）mm。
A．0.01～0.05
B．0.05～0.8
C．0.8～1.5
D．1.5～2
