西汉初年，文帝、景帝吸取秦亡的教训，轻徭薄赋，发展生产，出现了“文景之治”的局面

阅读理解。

      Most American families are smaller than the families in other countries. Most American families have one or two parents and one or two children

each.

      Children in the US will leave their parents’ home when they grow up.

They usually live far from their parents because they want to find good jobs. They often write to their parents or telephone them. And they often go to visit their parents on holiday.

      Parents usually let their children choose their own jobs. Americans think

it important for young people to decide on their lives by themselves.

      Children are asked to do some work around their houses. And in many

families, children are paid for some housework so that they can learn how to make money for their own use.

1. The size of most American families is        that of other

countries.                    

A. larger than            

B. smaller than

C. as big as              

D. as small as

2. When children grow up, they leave their parents' home to         .

A. get married          

B. be free

C. find good jobs      

D. study

3. They usually visit their parents           .

A. on weekdays        

B. on weekends

C. at any time          

D. on holiday

4. Which of the following statements is WRONG?

A. Children have the freedom to choose their own jobs.

B. Parents don't ask their children to do the housework.

C. Parents think it important for children to make their own decisions.

D. When children grow up, they usually live far away from their home.

5. Some parents pay their children for doing housework because_______      

A. children can learn how to make money for themselves

B. their children require them to do so

C. they are rich

D. it is required by law

q₁、q₂为真空中的两个点电荷，设它们之间相互作用力的大小为F，关于F可以写出三个表达式，一个是，另一个是，再有一个是。关于这三个表达式下列说法中正确的是[ ]

A．前两种表达的形式不同，但采用的物理观点相同

B．前两种表达的形式不同，采用的物理观点也不同

C．后两种表达采用的物理观点相同，表达的内容也完全相同

D．后两种表达采用的物理观点不同，但表达的内容完全相同

头癣中可形成瘢痕的有（）

A.黄癣

B.白癣

C.黑点癣

D.脓癣

可以在细菌的胞内行寄生生活的细菌是（）。

A.衣原体

B.病毒

C.噬菌体

D.蛭弧菌

校验熔断器的最大开断电流能力应用（）进行校验。

A.最大负荷电流

B.冲击短路电流的峰值

C.冲击短路电流的有效值

D.额定电流