Everybody knows that the United Kingdom consists ____ four countries: English, Scotland, Wales plus Northern Ireland. However, about four hundred years ago Scotland tried to break away from English ____(influent). The Scots wanted to attack England and ____(decide) that France should take the place of England ____ their closest friend. England,____ was unhappy when the relationship between the two countries broke down. Queen Elizabeth I did not want to be left out of any decisions ____(do) with Scotland, so she divided the Scottish lords into several groups so that they would argue with each other instead of ____(attack) England. This ____(arrange) worked well until 1603 ____ Queen Elizabeth died. As King James of Scotland was her only relative, he became King of Scotland and England, and everybody was ____(delight) with the solution.

如图在Rt△ABC中，∠C=90°，AB=15，sinA=$\frac{1}{3}$，则BC等于（　　）

液态水的存在是地球生命起源和发展的重要条件之一．下列叙述中与地球液态水的存在有密切关系的是（　　）

    6世纪下半叶，日本国内出现统治危机。公元646年（大化二年）元旦，日本统治者任用一些从中国归来的留学生，针对日本的政治、经济进行了一系列的改革。

    西罗马帝国于公元476年灭亡后，拜占廷帝国依然保持着它的繁荣。公元6世纪，皇帝查士丁尼西征，浪费了大量的人力物力，加剧了帝国的政治危机。而拜占廷帝国仍陶醉于已有的辉煌成就，不屑于学习和吸纳其他文明的优点和长处。