问题 解答题

我们学校塑胶跑道跑一圈是200米,相邻两道相距1.2米.学校举行运动会,200米决赛时,相邻两道起跑线相差多少米?

答案

设相邻两跑道的里面一圈跑道的两段半圆的半径为R米,则相邻两跑道的外面一圈跑道的两段半圆的半径为(R+1.2)米,

里面一圈跑道的两段半圆的弧长=2πR,外面一圈跑道的两段半圆的弧长=2π(R+1.2)=2πR+2.4π,

则相邻外面一圈跑道比里面一圈跑道长2.4π,

所以在划定一次200米跑的起跑线时,相邻两跑道的起跑线相差应为2.4π,

即2.4×3.14=7.536(米).

答:相邻两道起跑线相差7.536米.

阅读理解

阅读理解

     As Mrs Thompson stood in front of her 5th grade class on the very first day of school,  she told the

children a lie. Like most teachers,  she looked at her students and said that she loved them all the same.

But that was impossible,   because there in the front row,   slumped in his seat,   was a little boy named

Teddy Stoddard.Mrs Thompson noticed that he didn't play well with the other children,   that his clothes

were messy and that he constantly needed a bath.And Teddy could be unpleasant. It got to the point

where Mrs Thompson would actually take delight in marking his papers with a broad red pen,   making

bold Xs and then putting a big "F" at the top of his papers.

     However,   when she reviewed his file,   she got a surprise.

     Teddy's first grade teacher wrote,   "Teddy is a bright child with a ready laugh. He does his work

neatly and has good manners… He is joy to be around."

     His second grade teacher wrote,   "Teddy is an excellent student,   well liked by his classmates,  

but he is troubled because his mother has a terminal illness and life at home must be a struggle."

     His third grade teacher wrote."His mother's death has been hard on him.He tries to do his best but

his father doesn't show much interest and his home life will soon affect him if some steps aren't taken."

     Teddy's fourth grade teacher wrote,   "Teddy is withdrawn and doesn't show much interest in study.

He doesn't have many friends and sometimes sleeps in class."

     Now,   Mrs Thompson was ashamed of herself and felt worse when her students brought her

beautifully wrapped Christmas presents.Teddy's present,   however,   was clumsily wrapped in rough

brown grocery paper.Taking her time she opened it to reveal Teddy's gifts,   a shine stone bracelet with

stones missing and a quarter full perfume bottle.How the children laugh!"What a pretty bracelet! Mm,  

lovely perfume! Perfect on my wrist." The children were silent.

     Alone together,   after school,   Teddy told Mrs Thompson,   "Today you smiled just like my Mom

used to."His teacher cried all right,   and from that day,   she stopped teaching reading,   writing,   and

arithmetic and began to teach children instead.

1. What is the best title of this text?

A. A Student's Best Friend

B. How To Be a Good Student

C. The Story of a Good Teacher

D. A Teacher's Lesson

2. Which of the following is true about Teddy?

A. He only bathed once a week.

B. He had no friends at school.

C. His clothes were usually untidy.

D. He was the worst student in the class.

3. How did Teddy's behavior change between Grades 1 and 4?

A. He became better at making friends.

B. He became closer to his friends.

C. He paid less attention to school.

D. He stopped doing his homework.

4. Why did Mrs Thompson feel ashamed after she read Teddy's file?

A. She didn't treat Teddy fairly at first.

B. She was being unpleasant to Teddy.

C. She took delight in failing Teddy in the exam.

D. She disliked Teddy for all his problems.

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