水垢颜色为白色的是（）水垢。
A、硅酸盐
B、含油
C、碳酸盐
D、硫酸盐
参考答案：C
(1)接受批评 (2)按要求去做(3)分派任务 (4)出现失误(5)改进工作
A．2 - 1 - 5 - 3 - 4
B．5 - 4 - 1 - 3 - 2
C．4 - 2 - 1 - 5 - 3
D．3 - 2 - 4 - 1 - 5
The author quite possibly believes that the function of the wholesaler is ______.
A．good but too costly
B．necessary but harmful
C．removable but necessary
D．acceptable but unnecessary
