①诚然，从事科学探险的志愿者要有殒身不恤的精神，但领导者和组织者要尽全力保障他们的生命安全。

②小错误也不能放过，须知集腋成裘，小错积多了，也会对工作造成大的损害。

③哪知都督传见他后，东问西问绕了好大的一个圈儿，后来图穷匕见，道出本意。

④各单位务必完善请假制度，对那些请三天假休息十天，甚至“黄鹤一去不复返”久假不归的人要严肃处理。

⑤他这番话，冠冕堂皇，其实都是针对我的，无非是说我无能，该下台。我明白，项庄舞剑、意在沛公嘛！

若﹣mx²y^|n﹣3|是关于x、y的10次单项式，且系数是8，求m+n的值．

随着升学考的来临，我们的初中生活也即将结束。三年的初中生涯，总有一些难以忘怀的时刻。仔细阅读以下四段材料，从A、B、C、D中选择一个合适的标题。并完成（2）小题

    ①    

     Hello, I'm Tom. I remember at one time, when we were running on the playground, I was too tired to go on. As I wanted to give up, some of my classmates cheered me up. My classmates' encouragements helped me finish the run. I'll never forget it.

    ②    

     Hello, I'm Mary. When I was in Grade Two, I didn't prepare well for an English contest. I said sorry to my teacher. He said: “Any opportunity is important. You should never give it up easily.” Later on, I made good use of every opportunity. I'll never forget him.

    ③    

     Hi, I'm Lucy. The time I traveled to Qingdao with my classmates was the most unforgettable experience. We swam in the sea and caught crabs (螃蟹) on the beach. We played games and enjoyed the beautiful scenery. I will never forget that trip.

     ④   

     Hi, I'm Jim. I took part in the red song competition with my classmates last year. Every day, we rehearsed(排练) very hard in order to get a good result. Because of our hard work, we achieved a good result in the competition.

如图有关植物激素的叙述，正确的是（　　）