下面一段文字衔接最恰当的一组是①同时，舰体会携带某种拖曳式发音器在水中发出巨大的声响。②在这两根电缆通上电以后，就会在水中形成强大的电磁场。③各国军队在水中扫雷的方式基本大同小异。④除了大家熟悉的切割扫雷法之外，扫雷艇还用电磁和音响这两种扫雷方式。⑤沉底雷和浮雷的引信接收到这些磁场和声场信息后，就会自动上浮引爆。⑥电磁扫雷是指扫雷艇用两根长达数百米的电缆拖在舰后从需要扫雷的水面开过。

ne had a form in his hand,but no one knew which office____

What coloris it —____

______ you work hard, you’ll succeed some day

Any news about Bill Clinton? —-He left power three years ago and has a little now and a little then been ______