用中文写出下列缩写字母的含义：ABC、BBC、NBA、CBA、UFO、PLA、HK、UN？？？

小学英语题目。求帮助，谢谢了。~

一、改动（可增减）下列单词的一个字母，使其符合括号里的要求。
1.six→mix（动词） 2.coat→boat（交通工具）3.cook→book（文具）4.many→mary（人）
二、根据首字母提示补全对话。
A：Welcome （b ack ）to school，Mike.
B：（Hi ），Liu Tao.
A：There is a （new ）subject this term.Do you know？
B：Yes.It′s Science.
A：Do you （l ike ）it？
B：Yes.It is fun.
A：When do we （h ave ）this （lession ）？On Monday？
B：No.It′s on Friday.
三、你能用中文写出下列缩写字母的含义吗？ABC（(American Broadcasting Company） BBC（British Broadcasting Corporation）NBA（National Basketball Association）CBA（Chinese Basketball Association）UFO（unidentified flying object）HK（Hong Kong）UK（United Kingdom of Great Britain and Northern Ireland）PLA（The Chinese People's Liberation Army）UN（United Nations）USA（United States of America）
四、趣味猜猜看。
（）1.From what number can you take half and leave nothing？b
A.7 B.8 C.9
（）2.What 5-letter word has 6 left when you take 2 letters away？c
A.Fourth.B.Fifth.C.Sixth.
五、脑筋急转弯
1.What can you swallow that can also swallow you？water

六、阅读理解。
In my home,there′s a smallroom for me.It′s my bedroom.It′s clean and tidy.There is a desk,a chair and a bed in the room.The desk is near the window.There′s no TV in my room,but there′s a radio in it,It′s on my desk now.There are some books on the desk too.The chair is near the desk.Under the bed,there is a football.There are three pictures in my room.They are on the wall.There′s a photo on my desk.It′s a photo of my family.You can seethree people in it.They are my father,my mother and me.
根据短文内容填空
There are （3）people in my family.They are my （father）,my（father）and（me）.I have a bedroom.It′s （small）but （clean）and tidy.There′s near the （desk）.On the desk,there′s（no）TV.There′s a （radio），a （photo）of my family and some （books）on it.On the wall，there are （three）pictures.

你可以自己复制每一个缩写英文，去百度搜索中输入意思，就能弹出啦，而且有全称，非常方便简洁，很多东西可以自己查找到的

ABC:基础知识，BBC:英国广播公司，NBA：美国篮球协会，CBA：中国篮球协会，UFO：不明飞行物，PLA:中国人民解放军，HK：香港，UN：联合国。

BBC英国广播电台,NBA美国职业篮球联赛,CBA中国职业篮球联赛,UFO不明飞行物体,HK香港,UN英国联邦王国

ABC(American borned chinese)
　　在美国土生土长的华人
1.BBC=Britisher Born Chinese 在英国出生的中国人
2.BBC=British Broadcasting Corporation英国广播公司

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用中文写出下列缩写字母的含义：ABC、BBC、NBA、CBA、UFO、PLA、HK、UN？？？视频