某同学在实验室里用下列装置进行实验，请回答下列问题：

（1）实验室里用双氧水和二氧化锰制取并收集干燥的氧气，上述装置的连接顺序是（填接口的数字）____ 接　____ 、____ 接____ ，该反应的化学方程式是____ ；

（2）实验前，如何检查上述气体发生装置的气密性？____ 

（3）此连接装置在实验室还可以用来制备另一种干燥的化合物气体，反应的化学方程式为____ ．

为了配制100mL 1mol•L^﹣1的NaOH溶液，其中有下列几个操作：①NaOH固体放在纸上进行称量 ②选刚用蒸馏水洗净的100mL容量瓶进行配制　③NaOH在烧杯里刚好完全溶解，立即把溶液转移到容量瓶中 ④用蒸馏水洗涤烧杯内壁和玻璃棒2次，洗涤液也均转入容量瓶中 ⑤使蒸馏水沿玻璃棒注入容量瓶，直到溶液的凹液面恰好与刻度线相切．其中错误的是（   ）

阅读下面短文，掌握其大意，然后在所给的四个选项（A、B、C和D）中选出一个最佳选项。

    I was the tallest girl in my class when I started school. It made me feel 1and I believed that I looked very fat and ugly. The small girls were seen as smarter, so they were more popular and got more2 from teachers. I began to hate myself  3 not being small when I was seven years old, and by adulthood, I felt sad about my appearance.

    I didn't dare to look into the mirror  4  one day my friend pulled me to the mirror to let me see that I had a good figure. It's true that I was in good shape. Then I did something kind for 5—I bought a beautiful dress for myself. I felt very happy! Happiness wasn't a part of my life as I was too busy6 others. I always thought following others could make me more popular. But it's hard to be happy when you don't see your own 7  .

    Each small kindness to me made me   8  myself more. I'd do something loving and feel happier, which made me want to do 9 . That focus on myself  10   deep self-love.

    Today my self-love is very   11   .It has helped me develop self-confidence and led me to  12  myself from an unhappy school teacher to a popular writer. Now I see myself  13  a very beautiful woman. I have a wonderful body without 14 .  

    Please join me in taking steps to develop self-love. Every little loving act you do for yourself helps you build  15.

一位老人生于1850年，卒于1902年，他一生可能经历哪些事情（    ）
①鸦片战争②第二次鸦片战争③甲午中日战争④八国联军侵华⑤林则徐虎门禁烟

一个长方体的体积是100cm³，它的长是ycm，宽为5cm，高是xcm．