问题 填空题

在拔河比赛中,指导教师让学生穿的运动鞋的鞋底的花纹要深,拔河时手要使劲握住绳子.前者是通过______方法增大摩擦;后者是通过______方法增大摩擦.

答案

增大摩擦的方法:增大压力和增大接触面的粗糙程度.

(1)拔河时脚要穿鞋底花纹大的鞋,这是在压力一定时,通过增大接触面的粗糙程度来增大摩擦.

(2)手要将绳子握紧,这是用在接触面粗糙程度一定时,增大压力的方法来增大摩擦;

故答案为:增大接触面的粗糙程度,增大压力.

阅读理解

In the 1930s a young traveler was climbing the French Alps(法国阿尔卑斯山).He arrived at big piece of land without living things.It was ugly.It was the kind of place you hurry away from.

Then,suddenly,the young traveler stopped on the way.In the middle of this large land there was an old man.On his back was a bag of seeds.In his land was an iron pipe(铁管).

The man used the iron pipe to make a hole in the ground.Then from the bag he took a seed and put it in the hole.He did this again and again.

Later the old man told the traveler,“I’ve planted over 100,00 seeds.Perhaps only a tenth of them will grow.”

The old man’s wife and son had died,and this was how he chose to spend his final years.

“I want to do something useful,”he said.

(1)二十年以后那个年轻的游客已不再年轻。 He retutned to the place.What he saw amazed him.He could mot believe his eyes.The land was covered with a beautiful forest two miles wide and five miles long.Birds were singing,animals were playing,and wild flowers were here and there.

(2)The traveler stood there remembering the lifeless picture of the place that it once was.A beautiful forest stood there now,all because someone cared.

小题1:Why did the ola man plant seeds?_____________________________________________

小题2:How many seeds did the old man think could grow,all of them or only some?___________

小题3:What amazed the young traveler when he returned to the place?______________________

小题4:将短文中画线句子(1)翻译成英语。___________________________________________

小题5:将短文中画线句子(2)翻译成汉语。___________________________________________

选择题