风暴来临前夕,水母会发生异动,最可能是导致水母异动的原因是()。
A、次声波
B、电磁波
C、海水波动
D、紫外线
参考答案:A
—Did your father phone you shortly after the accident?
—No, it was a fortnight ________ he gave me a phone call.
A.since
B.when
C.while
D.before
简述我国婚姻法关于婚姻成立的实质要件。