根据短文内容．回答下列问题。
More and more young people from China begin to celebrate ( 庆祝 ) Father’ s Day. They send fathers presents, or invite them for a nice dinner. But do you know how Father’s Day started?
While Mrs Dodd, from America, was listening to a talk about Mother’ s Day in a church in 1909, she had an idea of having Father’s Day to honor(纪念) her father, William Smart. Mr Smart used to be a soldier. His wife died when she gave birth to her sixth child. Mr Smart had to raise his six children alone. They lived a hard life. After Mrs Dodd grew up, she wanted to thank her father for what he had done for them. She wrote a letter to a church and asked for the third Sunday in June to be Father’ s Day. The church agreed with her.
The first Father’ s Day was celebrated on June 19th, 1910 in Washington. Children made special desserts, and did other things to make their fathers happy. In 1924, President(总统) Calvin Coolidge supported the idea of a national Father’ s Day. People all over the country began to celebrate Father’s Day. Finally, in 1966, President Lyndon Johnson made the third Sunday in June Father’s Day.
This year, Father’s Day was on June 17th. What did you do for your father?
小题1:What do the young people usually do to celebrate Father’ s Day in China?
小题2:Was Mrs Dodd’ s life hard when she was young?
小题3:Why did Mrs Dodd warn to have Father’ s Day?
小题4:Did Mrs Dodd write a letter to a church or to the president?
小题5:When was Father’s Day celebrated for the first time in America?
可知，电容器的电容减小，则由C=
得电荷量不变，则U增大，指针张角变大，故A错误；将M板向左移动，则增大了极板间的距离，由决定式可得，C减小，同理可知指针张角变大，故B错误；在MN之间插入云母板时，介电常数增大，则由电容器的决定式可知C增大，则可知U减小，故指针张角减小，故C正确；M、N之间插入金属板时，减小了板间距离，则d减小，C增大，由A的分析可知，U减小，故指针张角减小，故D正确；