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问题 不定项选择题

一定量的盐酸跟足量镁粉反应时，为了减缓化学反应速率，且不影响生成的H2的总量，可向盐酸中加入适量的[ ]

A．NaOH固体

B．H2O

C．CH3COONa固体

D．醋酸

答案

BC

完形填空
完形填空。
      I want to go to the People's Hospital to see my friend Li Xia, 1 _____ I don't know the way. I need
some 2 _____. Just then 3 _____ old woman walks past. I ask her, "Excuse me, 4 _____ is the way to the
People's Hospital?" "Sorry, I don't know. You can 5 _____ that policeman over there," she says. "Thank you
all the same," I say. Then I go to the 6 _____. "Excuse, where is the People's Hospital?" I ask. The policeman
says, "It is not far 7 _____ here. It's 8 _____ five minutes' walk. Go along this street, and 9 _____ right
10 _____ the third turning, and you can find it."
     "Thank you very much. Goodbye!"
     "That's all right. Bye!"
( )1. A. so   
( )2. A. help 
( )3. A. a   
( )4. A. where
( )5. A. ask  
( )6. A. doctor 
( )7. A. to  
( )8. A. at   
( )9. A. turn  
( )10. A. at  		B. but   
B. helps  
B. an       
B. how  
B. tell                 
B. teacher
B. from   
B. about  
B. to     
B. in      		C. and     
C. friend  
C. the     
C. what   
C. say                
C. old man 
C. for   
C. of     
C. walk   
C. on    		D. or       
D. friends  
D. /        
D. which    
D. talk    
D. policeman 
D. away      
D. for       
D. take      
D. under   
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单项选择题

在处理决策支持系统时，以下哪一项是实施风险（）。

A.管理控制

B.结构化层次

C.无法确定用途和使用方式

D.决策过程的变化
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