如图，A、B为两等量异号点电荷，dbe为中垂线，ab＝bc、be=db,则 (   )

A．a点与c点的电场强度相同      B．a点与c点的电势相同

C．a、b间电势差与b、c间电势差相同    D．在d点释放一电荷，它将在中垂线上d、e之间来回运动

—Can you guess ______ the new schoolbag yesterday?

—Sorry, I’ve no idea.

A．how much did he pay for

B．how much he spent

C．how much he paid for

D．how much did he spend