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.

阅读下面的材料，根据要求写一篇不少于800字的文章。

    一个年轻人拜船工为师学划船，船工要求他先学会游泳。

    年轻人问为什么，船工说：“如果你不会游泳，那么你在划船时就会担心自己失足落水，而一旦有了这个担忧，就难于专心致志地划船了。”

    年轻人说：“我不会游泳，学划船时就会心怀忧虑，小心翼翼，不敢犯错，这样不是会学得更认真更快吗？”

    要求选好角度，确定立意，明确文体，自拟标题；不要脱离材料内容及含意的范围作文，不要套作，不得抄袭。

I am a middle-school student. Now let 1 tell you something 2 our classroom. It's very 3 There are two maps4 the back wall. 5is a map of China.6 is a map of the world (世界).There are7 desks and chairs in our classroom. There is a big desk 8 theteacher in the front of it. We 9 four classes in the 10 and two in the afternoon

设全集是实数集R，A={x|2x²﹣7x+3≤0}，B={x|x²+a＜0}．

（1）当a=﹣4时，求A∩B和A∪B；

（2）若（∁_RA）∩B=B，求实数a的取值范围．