问题 单项选择题

近几年有些大型的游乐项目很受年青人喜欢,在一些丛林探险的项目中都有滑索过江的体验。若把滑索过江简化成如图的模型,滑索的两端固定,且近似可看成形状固定不变的圆弧,某人从滑索一端滑向另一端的过程中,那么()

A.人的运动可看成是匀速圆周运动

B.人在滑到到最低点时处于失重状态

C.人在滑到最低点时重力的瞬时功率最大

D.人在滑到最低点时绳索受到的压力最大

答案

参考答案:D

解析:

人在运动过程中,向下运动时速度越来越快,而向上运动时速度越来越慢,因此A错误;人在滑到到最低点时加速度向上处于超重状态,B错误;人在滑到最低点时速度恰好水平,而重力竖直向下,两者相互垂直,因此重力的功率为零,C错误;人到达最低点时速度最快,而此时向下的力向心力最大,因此绳子拉力最大,D正确。

阅读理解

(1)I was only an 11-year-old girl when my parents told me that we would soon move to America. We were on the bus then. I was crying, and some people on the bus were turning around to look at me. I remember that I could not bear(忍受)the thought of never hearing the radio program for school children again which I listened to every morning.

In fact, I think I cried very little when I was saying goodbye to my friends and relatives. When we were leaving, I even felt a little excited because I thought about all the places I was going to see—the strange and magical places I had known only from books and pictures.

The first four years in America taught me the importance of optimism(乐观), but the idea did not come to me at once. For the first two years in New York I was really lost—having to study in three schools and I (2)________most of my time(2)_________learning the English language.I hardly had any time for fun. Sometimes I did not quite know what I was or what I should be. Mother remarried(再婚), and things became even harder for me. It took me some time to get used to my stepfather(继父). I was often sad, and saw no end to “the hard times.”

I had to do many things for the family since I knew English better than everyone else at home. I wrote letters, filled out forms, translated(翻译)all kinds of information and took my grandparents to the doctor and translated there.

Luckily, things got better and better later and almost all common troubles went away at last  From those experiences I have learned one important rule: Something good is certain to happen in the end when you do not give up, and just wait a little!

小题1:将(1)句译成中文:_________________________________________________________

小题2:在(2)处填入两个合适的词,使句意完整,上下文通顺:__________; __________

小题3:回答问题:Why did the writer feel excited when they were leaving?

_______________________________________________________________________________

小题4:在文中找出此句的同义句:

Some time passed before my stepfather and I got used to each other.

_______________________________________________________________________________

小题5: 在文中找出主题句:___________________________________________________________

选择题