归档电子文件在利用过程中应采取哪些安全保密措施？

     Mr. Read has a large farm near a hill. He and his wife are busy all the day. They're often tired but
they have a lot of expensive things and they live a happy life.
     One day their sows(母猪) had twenty baby pigs. Mrs. Read had to look after them at home. And
at that time she had much housework to do. Several weeks later she let the baby pigs come out of the
pigsty(猪圈) and look for some food themselves. Her seven-year-old son John came back from school.  He was ready to help his mother. The woman was happy and told him to count them and see if they
were all there. The boy threw his schoolbag on the table and ran out. About half an hour later the
supper was ready, but the boy didn't come back. The woman had to go to see what was wrong with
her son. and she saw her son running after a baby pig.
     "What are you running after it for?"she asked."Are they all right?"
     "I counted nineteen, mummy, " said the boy.  "But only the fellow(家伙)  is running about so fast that
I can't count it all ! "
1. Mr. and Mrs. Read are _         .
A. workers        
B. farmers          
C. drivers        
D. doctors
2. Mr. and Mrs. Read are tired but _         .
A. they get a lot of money                    
B. they get little food
C. they want to leave the farm                  
D. they have enough food to eat
3. John found ___     so he was ready to help her.
A. his mother was very busy                
B. his mother was too tired to work
C. his mother was ill                      
D. his mother was hungry
4. Mrs. Read told her son to _         .
A. do some house
B. look after the pigs
C. give some food to the pigs
D. see is some of the pigs were missing(去失)
5. In fact (事实上), ______.
A. John couldn't count the pigs at all        
B. John was too young to catch the pig
C.  John wouldn't count the pigs          
D. all the pigs were there