We could all say that we have bad days as we go through life, but what does it take to have a really good day?

    I remember a day recently when I had to go to the 1 for special tests because I wasn't feeling well and my doctor sent me to a specialist to try and find the cause of my illness.

    As I 2 to the hospital, I was feeling sad and certainly wasn't on top of my game. As I got to the hospital, I began my 3 for a parking lot. I finally found one not too far from the entrance to the hospital.

    As I got out and brought my change out of my pocket, I noticed a man looking a little 4 standing in front of a parking meter (停车记时收费表) two cars away. He seemed to be searching his pockets for what I supposed were 5 for the meter.

    Although I 6 didn't feel that great, I thought that I should at least go over to him and find out if I could 7 him. As I stood beside him, he turned to me looking worried. I asked him if he had a problem I could help with. He said that he had no coins at all because he was only thinking about visiting his sick wife when he left his house.

    I reached into my pocket and 8 out two dollars and gave it to him without saying a word. And, without waiting for a reply, I turned on my heel and said to him as I was walking away: “Have a good day.”

    The funny thing was that I felt a lot brighter, a small smile came to my face, and I seemed to walk just a little quicker. I was walking away when he called out: “Thank you so much.” You know, I didn't even 9 him to say anything. He didn't have to say a word to me. It was simply enough to know that I had helped someone else who needed a little10. That's all it took to bring a smile to my face as I went on toward completing my own business.

    You know, it doesn't take much to help someone else.

已知：$\left\{\begin{array}{c}x=2\\ y=3\end{array}\right.$是方程mx+3y=2的一个解，求m的值．

阅读下面的文章，完成问题。

凶手WiFi

引用自《黑龙江省龙东地区中考语文卷》

    ①近日，一群来自丹麦的女学生用水芹种子进行实验，得出了惊人的发现：WiFi信号可能会损害健康。

    ②由于学校没有监测大脑活动的设备，女孩们选择了水芹种子作为研究对象。她们将12个装有水芹种子的盘子平分为两组，其中一组放在没有任何WiFi信号的房间里；另一组则放在两台运行中的无线路由器旁边。十二天的时间里，覆盖有WiFi的房间内，大多数种子变成了褐色，然后死亡。而另一间房里的种子则正常生长。

    ③虽然有人认为，种子之所以在覆盖有WiFi的房间中死掉，可能是路由器散热所致。但此项实验结果还是加剧了人们对WiFi辐射的恐惧感，有些家长和教师们要求校园内禁止安置无线路由器。

    ④与此同时，实验也得到了荷兰研究者的力挺。三年前，荷兰的科学家选用白蜡树作为研究对象，他们将这些树木分别放在距六个辐射源0.5米处的位置，辐射源的频段介于2412赫兹到2472赫兹，功率为100毫瓦——和无线路由器相似。靠近辐射源种植的树木，树叶上出现了“具有类似铅光泽”的物质，导致叶片的上下表皮死亡，最终掉落。

    ⑤但是，美国的一些研究者对这些研究成果表示怀疑，他们认为，由于WiFi采用的是低强度的无线电波传输信号，其威力只是微波的十万分之一。在一间覆盖WiFi的屋子里待上一年，受到的辐射量仅相当于用手机进行20分钟通话。

    ⑥不过需要提醒的是，如果WiFi使用不正确，也极可能对人体造成伤害。那么，作为普通用户，在使用无线路由器时应该注意什么呢？21教育名师原创作品

    ⑦首先，人体接受的辐射量跟频率有关，频率越高，伤害越大。因此，家中没有必要使用功率过大的无线路由器。

    ⑧其次，辐射危害大小还跟距离有关，距离越远，危害越小。如果家中有孕妇、小孩、老人或免疫力低下者，最好让无线路由器与他们的活动范围保持较远的距离。

    ⑨第三，最好不要将WiFi设备放置在卧室内，尤其是放在床边。如果不使用WiFi，最好将无线路由器关闭，以降低不必要的风险。

    ⑩还有，别在腿上使用笔记本电脑，最好将电脑放在桌子或托架上。

实验室制备大量二氧化碳气体时一定不需要用到的仪器是（）