问题 单项选择题

相同浓度下的下列溶液,PH值最大的是()。

A.NH3Cl

B.NaCl

C.CH3COOH

D.NaHCO3

答案

参考答案:D

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完型填空。
     The computer was one of the most important inventions of last century. The first computer was as large
as a room. Now some computers are as    1    as television sets. Some computers can even be made smaller
than a book. About 20 years    2   , the computer was a strange machine in china. Not many people
understood it and said yes to it. 
     Today much of that is    3   . In 1984, when Deng Xiaoping    4    two pupils working on the computers
in Shanghai, he said that computer lessons would start from children. So there was the first computer book
for middle school students. Now in shanghai    5   all middle school have classrooms for computer courses
(课程). Some of the students now have their    6    computers at home. With the help of internet (因特网),
they can send and    7   messages and emails. They can learn about the world more quickly. Now computer
are    8    used in banks, factories, airports and so on. The computer is coming into everyone's    9  , so it is
important for us to learn   10   to use a computer freely.
( ) 1. A. huge      
(     ) 2. A. over      
(     ) 3. A. changing  
(     ) 4. A. looked   
(     ) 5. A. most     
( ) 6. A. new               
( ) 7. A. receive  
( ) 8. A. recently 
(     ) 9. A. life     
( ) 10. A. when    
B. small     
B. before    
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B. heard           
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D. watched         
D. no                              
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D. living         
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