一组数据2，5，1，6，2，x，3中唯一的众数是x，这组数据的平均数和中位数的差

阅读理解。

     Mr. Green lives in a big city with his wife and two children. One morning Mr. Green takes his new

car and washes it when a friend comes. The friend stops and looks at the new car for a minute.

     Then he asks, "That's a new car. Is it yours? "

     "Sometimes." Mr. Green answers.

      The friend is surprised (惊奇). "Sometimes? " he says. "What do you mean?" Mr. Green answers

slowly, "Well, when there is a party in town, my daughter Jean drives it. When there is a football game,

it's my son Jim's turn. When I washes it and it looks very nice and clean, my wife Linda uses it. And

when it needs cleaning. It's mine. "

1. Mr. Green lives _____. [ ]

A. in a small town

B. in a fact

C. in a big city

2. There are _____ people in Mr. Green's family.[ ]

A. three

B. five

C. four

3. Mr. Green's car is _____. [ ]

A. new

B. old

C. always clean

4. Why the car belongs to his son Jim when there is football?[ ]

A. Because the rest of family members go to watch the football match.

B. Because Jim is a football player.

C. Because Jim goes to see the football match by car.   

5. When the car is dirty, it is _____. [ ]

A. Jean's

B. Mr. Green's

C. Jim's

— How are you? 

— ___________ am fine, thanks.[ ]

A. My

B. I

C. You

介绍经纪商在国际上一般都以( )的形式存在。

A．由期货公司担保

B．独立执业

C．个人

D．机构

简述煤矿井下供电安全规定。

断路器（）回路中对弹簧操动机构，应有弹簧拉紧与否的闭锁。

A.控制

B.合闸

C.跳闸