单位职工个人应当缴纳的社会保险费，由（）从其本人工资中代扣代缴。
参考答案：单位
电压互感器的二次回路和三次回路（）。
A、必须分开
B、不需分开
We were sad to learn that several students were______ by a car yesterday. [ ]
A. hit out
B. knocked over
C. run across
D. picked up
