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问题 单项选择题

鉴别脑膜炎奈瑟菌与卡他布兰汉菌的相关试验是（）

A.蔗糖发酵试验

B.乳糖发酵试验

C.麦芽糖分解试验

D.触酶试验

E.菊糖分解试验

答案

参考答案：C

完形填空
完形填空
       Brian is doing   1   now. He's working hard at school. He is happy in Canada.
       This week, he got to know   2   neighbourhood. On Monday, Jenny walked to school   3   him and
she showed him her favourite places. There   4   a bakery near his house. He can buy bread there.   5   his way to school, he can buy books at the   6  . He thinks   7   is not easy to live in a new neighbourhood.
Yesterday, he   8  . A young woman helped him   9   his way. Tomorrow, he   10   buy a map of the city.
He will keep it in his backpack. Then he won't get lost again.
( )1. A. good          
( )2. A. he            
( )3. A. with          
( )4. A. has            
( )5. A. At            
( )6. A. shop          
( )7. A. this          
( )8. A. lost his way  
( )9. A. finds          
( )10. A. is going to   		B. well                
B. him                  
B. and                  
B. is                  
B. On                  
B. bakery              
B. it                  
B. lost his street      
B. find                
B. goes to              		C. happy            
C. his              
C. except          
C. was              
C. In              
C. bookstore        
C. what            
C. lost his bag    
C. found            
C. went to          
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单项选择题

制冷压缩机下列情况中必须停车加油的是（）。

①油泵吸入端有三通阀；

②曲轴箱有加油螺塞；

③曲轴箱有带间加油接头。

A.②

B.③

C.②③

D.①③
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