“酒驾”是当前热门话题之一。交巡警检查驾驶员是否饮酒的仪器里装有K2Cr2O7，K2Cr2O7中Cr元素的化合价为
①实行中央集权的政治制度
②加强各民族之间的联系
③结束分裂局面实线大一统
④由少数民主建立的政权
Manners in a dinner party
What to take
You can bring some drinks like ____ juice, beer or something like these.
When to arrive
You should arrive on time or no more than ____minutes late.
If you'll be fifteen late, you should give the host a ____.
What to do at the table
Try to be relaxed and ____ at the table. If you can't use the knife and ____ , you can watch others.
19世纪中期的印度民族大起义和美国独立战争的相同因素是（ ） ①都因受到了英国的殖民压迫而发生 ②都取得了胜利③都表现了反抗外来侵略的不屈不挠的精神 ④都颁布了重要的历史文献
