若3a^m+2b⁴与﹣a⁵b^n﹣1的和仍是一个单项式，则m+n=____．

   We can see walls everywhere in the world. But the Great Wall of China is the biggest of all. The Chinese call it. “The Ten-thousand-Li. Great Wall.” It’s in fact (事实) more than 6,000 kilometers long. It’s 4-5 meters wide. In most places, five houses or ten men can walk side by side. When you visit the Great Wall, you can’t help wondering (疑惑) how the Chinese people were able to build (建造) such a great wall thousands of years ago. Without any modern machine (机器), it was really very difficult to build it. They had to do all the work by hand. It took millions of men hundreds of years to build it.
   The Great Wall has a history of over two thousand years. The kings began to build the first parts of it around two thousand seven hundred years ago. Then, Qin Shihuang had all the walls joined up (连起来). He thought that could keep the enemy (敌人) out of the country.
Today the Great Wall has become a place of interest. Not only Chinese people but also people from all over the world come to visit it.

一年一度的“两会时间”再次开启，每年3月召开的“全国会议”被称为“中国政治季”。2016年3月3日下午，全国政协十二届四次会议在北京人民大会堂隆重开幕。3月5日，十二届全国人大_____次会议也将开幕。（    ）