检验试管中盛有的少量白色固体是铵盐的方法是（） A．加NaO_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

检验试管中盛有的少量白色固体是铵盐的方法是（　　）

A．加NaOH溶液，加热，用湿润的红色石蕊试纸在试管口检验，看是否变蓝色

B．将固体加热，将产生的气体通入紫色石蕊试液，看溶液是否变红色

C．加水溶解，用PH试纸测溶液的酸碱性

D．加入NaOH溶液，加热，再滴入酚酞试液

答案

答案：A

选择题

读“北半球某流域示意图”，回答下列小题。

小题1:图中各地形成的地貌类型说法正确的是

A．A地为槽型河谷

B．乙地比甲地河流的侵蚀作用

C．C地为河漫滩平原

D．B地三角洲平原小题2:C地比A地更容易发展成为城市，理由是C地

① 水源充足，植被茂盛，环境好 ② 靠海，可以发展江海联运

③ 地形复杂多样，可以发展多种产业 ④ 地势平坦开阔

A．①②

B．③④

C．②④

D．①③

完形填空

On my birthday this year, I decided to do something very different. I had been   31  so much and I wanted to reach out to bring happiness to someone else. So, that   32 , I bought some flowers and went to a hospital. I had no   33  who I was going to present the flowers to, but I would find someone who needed   34 .
I asked the nurses in the hospital, who thought it   35  that I didn’t have anyone in particular to see.   36 , they gave me the room number of a(n)   37  lady, who needed some comfort.
I entered the room with the flowers. The elderly woman looked up, staring at me   38 . She was greatly moved when I told her about my   39  in being there. She was an amputee(被截肢者) and she explained to me that she was very worried   40  they were going to fit her with prosthetic leg(假肢). She knew that as she was getting used to the “ 41 ”leg, she would be in 42 .
Later, in the following two hours, we 43 a lot and both felt very happy. I 44  until it was dark. I will always remember how   45  she was the moment she received the flowers from me—a   46 . She called me her angel and said she had no more   47 .
I   48  that story with my neighbor and she   49 that she was going to do the same thing on her birthday. And I hope that she will   50 others to be kind and do the same thing. You never know you might be considered someone’s angel one day.

A．paying attention to	B．cheering up
C．looking after	D．looking down upon

C．disappointed