问题 填空题

请阅读下列资料,并回答相关问题:

资料一:碳酸氢铵(NH4HCO3)是一种常用的氮肥.碳酸氢铵与碱性物质混合时,会产生一种有刺激性气味的气体﹣﹣氨气,而降低肥效.碳酸氢铵受潮时,在常温下就能分解,温度越高,分解越快.

资料二:草木灰是常用的农家肥,主要成分是碳酸钾,其水溶液呈碱性.

(1)贮存NH4HCO3时应注意_________

(2)小明的叔叔在施肥时,为了提高肥效,将钾肥草木灰与氮肥NH4HCO3混合施用.请你运用所学化学知识解释这种做法是否合理._________________________

答案

(1)注意防潮、避免高温;

(2)不合理;因为草木灰的溶液显碱性,与NH4HCO3混合施用会生成氨气而跑掉,而减低肥效.

完形填空
完形填空。
     A few days ago, my mom went to visit my grandparents. She wanted to stay there for a few days. It
was the first time that Dad and I    1    at home without Mom.    2    the first day, Dad and I went out for
a dinner. The next morning, we    3    got up late. I went to school without (没有) eating breakfast. I didn't
feel    4    all day long. After school    5    I got home, I looked around. What a mess(杂乱)! I had to clean
the rooms and did the dishes and the laundry. I was    6    after doing all of the housework. That evening I
got a    7    from Mom. She said she would come back the next day. I felt very happy to    8    that.At that
time I realized that Mom did    9   housework everyday. I told my dad that we should   10   to help Mom.
He agreed.
( )1. A. studied   
( )2. A. On         
( )3. A. both      
( )4. A. hungry     
( )5. A. before    
( )6. A. busy           
( )7. A. call      
( )8. A. listen    
( )9. A. a little   
( )10. A. want       
B. worked    
B. In          
B. all       
B. sorry      
B. when       
B. angry            
B. meal       
B. hear       
B. too many  
B. stop    
C. stayed      
C. At       
C. only        
C. tired     
C. until      
C. happy            
C. book       
C. care        
C. much too   
C. forget  
D. did            
D. Of          
D. either      
D. well           
D. after                    
D. tired         
D. e-mail       
D. say            
D. too much     
D. try       
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