问题 选择题

下列实验能达到预期目的的是

A.通过电泳实验证明胶体带电

B.通常利用丁达尔效应区别溶液与胶体

C.渗析实验说明胶体粒子能透过半透膜

D.向煮沸的NaOH溶液中滴加FeCl3溶液可制备Fe(OH)3胶体

答案

答案:B

题目分析:A、电泳实验可以证明胶体中的胶粒带电,而不是胶体带电,错误;B、胶体有明显的丁达尔效应,可以用此实验来区分溶液和胶体,正确;C、渗析实验说明胶体粒子不能透过半透膜。错误;D、向煮沸的NaOH溶液中滴加FeCl3溶液可制备Fe(OH)3沉淀,错误。

改错题
单句改错。

(      )1.Bill often goes to see movies and his father.                        
                           A        B                C   D    
(      )2. My brother doesn't has dinner at home.                      
             A                   B       C                  D    
(      )3.  Why don't your like your history teacher?                      
                       A      B           C                  D    
(      )4. My sister is only three year old.                             
                     A   B          C      D    
(      )5. Ben's brother often play basketball with his friends after school.                                               A       B                  C              D    
(      )6. What can your uncle does, Sonia?                          
               A            B              C       D    
(      )7. Can you help me for my Chinese?                           
                    A    B          C            D    
(      )8.I don't like English because it's interesting.                  
               A             B                    C       D    
(      )9. What does your mother usually do at Mondays?                
                       A                          B      C  D    
(      )10. He likes bananas and  he doesn't like pears.    
                               A        B    C     D

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