对于点电荷的电场，我们取无限远处作零电势点，无限远处电场强度也为零，那么以下说法正确的是[ ]

A.电势为零的点，电场强度一定为零，反之亦然

B.电势为零的点，电场强度不一定为零，但电场强度为零的点，电势一定为零

C.电场强度为零的点，电势不一定为零；电势为零的点，场强不一定为零

D.场强为零的点，电势不一定为零，电势为零的一点，电场强度一定为零

Scientists have many theories about how the universe_____.

A．came into being

B．was coming into being

C．had come into being

D．would come into being