问题 完形填空
完形填空.
     Mr and Mrs Jones usually __1__ go out in the evening. But last Saturday, Mrs. Jones __2__ to
Mr. Jones,"There's a good film at the cinema this __3__. Can we go and __4__ it?"
     Mr. Jones was quite __5__ about it, so they went and __6__ it.
     They came out of the cinema__7__ o'clock, got into the car, and began __8__ home. It was very
__9__. Then Mrs. Jones said, " Look, Bill. A woman is _10__ very fast, and a man is running __11_
her. Can you see them?" Mr. Jones said, "Yes, I can." He drove the car near the woman and said to her,
"Can we help you?" "No, thank you," the woman said but she didn't stop _12__, " My husband and I
always run _13__ after the _14__ , and the last one _15__ the house. "
( )1. A. does    
( )2. A. said    
( )3. A. moming  
( )4. A. see      
( )5. A. pleased  
( )6. A. watch    
( )7. A. in      
( )8. A. togo    
( )9. A. black    
( )10. A. running
( )11. A. to      
( )12. A. to run  
( )13. A. home    
( )14. A. car    
( )15. A. clean  
B. don't    
B. sayed    
B. aftemoon  
B. watch    
B. pleasant  
B. see      
B. on        
B. going    
B. dark      
B. run      
B. for      
B. running  
B. to home  
B. me        
B. cleans    
C. didn't  
C. says    
C. evening  
C. look    
C. pleasure
C. enjoyed  
C. at      
C. driving  
C. deep    
C. to run  
C. after    
C. run      
C. of      
C. cinema  
C. cleaning
答案

1-5: BACAA    6-10: CCCBA    11-15: CBACB

实验题

甲醛是重要的有机合成原料,大量用于生产树脂、合成纤维、药物、涂料等,也是世界卫生组织(WHO)确认的致癌物和致畸物质之一。据中国室内环境监测工作委员会调查统计,中国新装家庭甲醛超标60%以上。我国规定室内空气中甲醛含量不得超过0.08mg/m3

(1)下列说法或做法不合理的是___________(填字母)。

a.用甲醛溶液浸泡水产品以长时间保持水产品的“新鲜”

b.刚装修的新房入住前房间内保持一定温度并注意通风

c.合成“吊白块”的反应NaHSO3+HCHO→ NaO-CH2-SO3H是加成反应

d.福尔马林可用于制作动物标本(或保存尸体)

(2)某研究性学习小组拟用甲醛法测定常见铵态氮肥的含氮量。

[资料:4NH4++6HCHO=(CH2)6N4H++3H++6H2O, 所生成的H+和(CH2)6N4H+可用NaOH标准溶液滴定,采用酚酞作指示剂] 用甲醛法测定含氮量,下列不适合的铵盐是_____(填字母)

a.NH4HCO3 b.(NH4)2SO4 c.NH4Cl

(3)I业上制甲醛的两种方法如下(数据均为298.15K下测定):

反应I:CH3OH(g)=HCHO(g)+H2(g) △H1=+92.09kJ/mol,K1=3.92×10-11

反应Ⅱ:CH3OH(g)+1/2O2(g)=HCHO(g)+H2O(g) △H2=-149.73kJ/mol,K2=4.35×1029

①绿色化学提倡化工生产应提高原子利用率。反应________(填“I”或“Ⅱ”,下同)制甲醛的原子利用率更高。从反应的焓变和平衡常数K值看,反应______制甲醛更加有利。

②如图是甲醇制甲醛有关反应的1gK(平衡常数的对数值)随温度T的变化。图中曲线(1)表示的是反应________ (填“I”或“Ⅱ”)。

(4)某研究性学习小组测定居室中甲醛的含量的原理如下:4MnO4-+5HCHO+12H+=4Mn2++5CO2↑+11H2O 如图,打开a,关闭b,用注射器抽取室内空气;关闭a,打开b,再推动注射器,将气体缓缓推入酸性KMnO4溶液中,使其充分反应。当B装置中________时停止推气。若总共取样为50L空气,则该居室内空气中甲醛的浓度为_______mg/m3

单项选择题