问题 改错题
短文改错。
     此题要求你对一段文章改错。先对每一行做出判断是对还是错。如果是对的,在该行右边横
线上画一个勾(√);如果有错误(每行不会多于一个错误),则按情况改错如下:
此行多一个词,把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。
此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。
此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
注意:原行没有错的不要改。
My English teacher was always too absorbed in the text in     
class that he never looked up. He had habit of asking a        
student to translate the text, and he often choose the same   
student without realizing them himself. The student, out      
of respect, didn't point it out. Before being called so many  
times, the student, his name was Jack, had to ask his friends 
for advices. The next day when the teacher asked Jack to      
translate the text, Jack answering, "He is absent today,     
because of he has a sick sister to look after at home".     
"All right," said a teacher, "you translate the text."
1.______      
2.______               
3.______     
4.______           
5.______                                        
6.______      
7.______                
8.______      
9.______          
10.______   
答案

1. too改为so    2. 在had后加a    3. choose 改为chose    4. them 改为it    5. Before改为After

6. his改为whose    7. advices改为advice    8. answering改为answered    9. of去掉    10. the-a

实验题

(22分)某中学化学兴趣小组想制取饱和氯水,并进行氯水的性质实验。他们使用如图装置制取较多量的饱和氯水,请回答:

(1)写出仪器的名称:A_________, B _________ 。

(2)写出丙、丁装置中发生反应的离子方程式:

丙_________________________________________________。

丁_________________________________________________。

(3)有同学提出如下改进建议:

①在乙和丙之间增加上图中的a装置,你认为有无必要_______ (填“有”或“无”)。

②在丙的长导管下口处,接上图中的b装置,可以提高氯气的吸收效果。原因是_______________________________                        ____。

(4)用制得的氯水分别进行下列实验:①滴入碳酸钠溶液中,有气体生成,说明氯水中发生反应的粒子是_____;

②滴入AgNO3溶液中,发生反应的离子方程式____________________________________。

(5)用滴管将制得的饱和氯水慢慢滴入含酚酞的NaOH稀溶液中。当滴到最后一滴时红色突然褪去。产生上述现象的原因可能有两种(简要文字说明):

①是由于__________________________________________;

②是由于__________________________________________。

用实验证明红色褪去的原因是①或者②的实验方法是__              ___      

                                                                 

(6)为了提高氯水中次氯酸的浓度,增强氯水的漂白能力,可向氯水中加入的试剂_____(填序号)。

A.CaCO3

B.Na2SO3

C.H2SO4

D.Ca(OH)2

单项选择题