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事务是（）和并发控制的基本单位。

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阅读理解
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     What is your wish for the New Year? The following is some children's ideas.
John: I wish to be a better boy to Mum and listen to her more. I also want to get better grades in school.
Kate: My wish is to change my school as there's too much to study in this school.
Ann: I wish I could spend more time with Mum. She should stop working at the bank and take up a job
at our neighborhood toy shop.
Peter: I wish someone would find a way to help me walk with my only leg, so I can take part in activities 
         and sports that I'm unable to do now.
Mary: I wish that I could save all my money, so I could buy presents for my mother, father and big sister
         on their birthdays.
Bob: I wish for good health though I'm badly ill. I want to finish high school and take an IT course after.
Mark: I wish I could get more money to fix our house. There is a big hole in the wall and big mice run
         inside the room.
1. How many children have mentioned their parents in the passage?
A. All.
B. Four.
C. Three.
D. None.
2. Who is badly ill among the children?
A. Kate.
B. Peter.
C. Mary.
D. Bob.
3. What's Mark's wish?
A. To get better grades.
B. To change his-school.
C. To buy some presents.
D. To fix their house.
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单项选择题

A．检查作业
B．一起吃饭
C．检查身体
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