问题 单项选择题

下列关于细菌分离培养时的无菌技术,错误的是()

A.细菌分离培养应在细菌实验室内进行

B.接种环分离和移种细菌时,用前用后均需灭菌

C.从试管培养物中取标本时,在打开管口或关闭前,均要在火焰上通过2~3次

D.因不慎菌液污染桌面后,可用3%来苏儿处理,至少浸泡10分钟

E.工作完毕后,用紫外线灯照射30分钟

答案

参考答案:D

完形填空
阅读短文,从各题所给的四个选项中,选出 一个正确答案。
     Once there was a king who told some of his people to dig a pond (池子). The king then told his
people that one person     1   each family had to bring a glass of milk during the night and put it into
the pond. So, by the morning, the pond should be    2    of milk.
     After     3    the order, everyone went home. As one man prepared his milk, he thought that since
everyone was bringing milk, he would just     4    a glass of water and put that into the pond instead. 
    5    it was dark at night, no one would notice it, so he quickly went and put the water into the pond
and    6     home.
    In the morning, the king went to visit the pond. To his   7    , the pond was only filled with water!
What happened? Yes! Everyone had the same idea     8    that man. They all thought, "I don't have to
waste my milk. Someone else will do it. "
    Dear friends, when you plan to help poor people or people in trouble, do not think that     9   will
take care of it. Instead, it starts with you. If you don't do it, no one else will, so change yourself and
make a    10    .
(    )1. A. at    
(    )2. A. filled
(    )3. A. giving
(    )4. A. hide  
(    )5. A. If    
(    )6. A. left  
(    )7. A. surprise
(    )8. A. with   
(    )9. A.  others
(    )10. A. face 
B. from       
B. empty      
B. refusing   
B. steal      
B. Since      
B. came       
B. satisfaction
B. to         
B. the others 
B. mistake    
C. on      
C. crowded 
C. receiving
C. waste   
C. While   
C. returned
C. joy     
C. as      
C. none      
C. living 
D. with     
D. full     
D. offering 
D. drink    
D. After    
D. arrived  
D. taste    
D. of       
D. neither  
D. difference
多项选择题