如图所示，A、B两点在同一条电场线上，一点电荷在A点的电势能为0.80×10^-8J，在B点的电势能为1.2×10^-8 J．则（　　）

A．该电荷为正电荷

B．该电荷为负电荷

C．A点电势比B点电势高

D．把该点电荷从A点移到B点，电场力做功为W=-4.0×10^-9J

选择与句中划线部分意思相同或相近的词或短语。

Class was over and the students came out of the classroom one after another. [ ]

A. up and down

B. here and there

C. by and by

D. one by one