Almost all of us have unpleasant habits. We all want to get rid of(摆脱) them, but we don’t know proper ways. Here’s some advice.

●Write down all the reasons why you want to stop some behavior. Look at the reasons very often.

●It’s clever to do something else when you want to stop your bad habits. If you get angry easily, for example, you can go out for a walk.

●Decide what you’ll do to reward(奖励) yourself if you really get rid of your bad habits.

●If you get too heavy, keep junk food out of your house.

●Bad habits develop over years, so you can’t get rid of them very soon. So you should be patient.

●Don’t be afraid to ask others for support. You can talk to your friends, family or other people. When you talk to them, they might be able to provide some advice that you can’t get from yourself.

聪聪同学在实验室帮老师整理废弃药品时发现一瓶没有标签的绿色粉末，对其组成很好奇。征得老师允许后，设计了以下实验进行探究。

【实验步骤】

①如图搭建实验仪器，并检验装置的气密性。

②在A装置中装入11.1g绿色粉末。关闭K₁，打开K₂、K₃，持续通入适量N₂。

③关闭K₂、K₃，分别称量装置B、C、D的质量，记录数据。

④打开K₃，点燃酒精灯加热绿色粉末直至装置C中无气泡产生时，关闭K₃，熄灭酒精灯。分别称量装置B、C、D的质量，记录数据。

⑤待A冷却后，打开K₁、K₃，持续通入适量CO，再次点燃酒精灯加热。

⑥当A中粉末全部变红后，熄灭酒精灯。试管冷却后，关闭K₁。称量装置A、B、C、D的质量，记录数据。

【实验现象和数据处理】

（1）、老师看了实验方案后认为，从环保的角度来看，此装置有一个缺陷，建议装置D后还应添加一个酒精灯，并在实验步骤     (填实验步骤的序号)中点燃

（2）、步骤②通入氮气的目的是：                      

【实验结论】

该绿色粉末的组成元素是：        ；各元素的质量比为：       （写出计算过程）