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Last week, while visiting my dad with my

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题目:

Last week, while visiting my dad with my daughter, we went to a restaurant for dinner. When we were seated, my dad asked the waitress if there were any soldiers eating at the restaurant. Then waitress said there was a soldier having dinner with his friend. My dad told the waitress to tell the soldier and his friend that their dinner was paid for! He also said that he did not want to be known as the benefactor(施主).

Then waitress later commented on my dad’s thoughtful behavior saying that she had never seen anything like this before. At a local college, she had studied opera and so she used this to thank my dad by performing a piece from The Pearl Fisherman. Her voice brought me to tears because it sounded perfect!

After a while, the soldier appeared at our table (I don’t know how he knew my dad paid the bill for him.) and said that he would be sent to the front the next morning and that he could not leave this country without saying “thanks” to my dad. My dad replied that it was he who wanted to say “thanks”. They shook hands as the soldier left.

Before we left, the waitress came by again. She did a magic show as another way to show her

“thanks” to my dad. Her show was really great. My dad left her a note with email address asking for her next performance time in addition to a $ 50 tip.

Everyone witnessed something exemplary(可作榜样的) in the human spirit that night. I can only hope to see more of this in the future.

68.What did the soldier do in response to the author’s father’s kindness?

A.He gave something to author’s dad.

B.He gave a big tip to the waitress.

C.He said thanks to the author’s dad in person.

D.He did a magic show for the author and her father.

69.The author considered her father’s action to be ____.

A.funny       B.understandable C.worthless  D.honorable

70.Their passage mainly tells us that we should ____.

A.learn to be grateful to others B.find ways to thank others

C.try to learn from each other    D.respect soldiers and waitresses

答案:

小题1:C

小题2:D

小题3:A

         

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题型:计算题

如图所示,某空间内存在着正交的匀强电场和匀强磁场,电场方向水平向右,磁场方向垂直于纸面向里。一段光滑绝缘的圆弧轨道AC固定在场中,圆弧所在平面与电场平行,圆弧的圆心为O,半径R=1.8m,连线OA在竖直方向上,圆弧所对应的圆心角θ=37°。现有一质量m=3.6×10-4 kg、电荷量q=9.0×10-4 C的带正电的小球(视为质点),以v0=4.0m/s的速度沿水平方向由A点射入圆弧轨道,一段时间后小球从C点离开圆弧轨道。小球离开圆弧轨道后在场中做匀速直线运动。不计空气阻力,sin37°=0.6,cos37°=0.8。 求:

(1)匀强电场场强E的大小;

(2)小球刚射入圆弧轨道瞬间对轨道压力的大小。

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