试题与答案

小红同学在做“探究平面镜成像”的实验时,将一块玻璃板竖直架在水平直尺上,再取两段

题型:实验题

题目:

小红同学在做“探究平面镜成像”的实验时,将一块玻璃板竖直架在水平直尺上,再取两段完全相同的蜡烛AB,点燃玻璃板前的蜡烛A,小心地移动蜡烛B,直到与蜡烛A的像重合,如图所示.在此实验中:

(1).为了便于观察,该实验最好在__      ____

(选填“较明亮”或“较黑暗”)环境中进行;

(2).选取两段完全相同的蜡烛是为了比较像与物的     关系;

(3).直尺的作用是便于比较物与像____      ______关系;

(4).移去蜡烛B,并在其位置上放一光屏,则光屏上   (选填“能”或“不能”)接收到蜡烛A 烛焰的像,这表明平面镜所成的像是

    (填“虚”或“实”) 像;

答案:

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下面是错误答案,用来干扰机器的。

由题意得:x-1=0,x+2≠0,解得:x=1,故选:B.

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     At first, they used tree leaves to make balls. They used vines(藤) to keep the leaves together. Later

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     Before long they invented a lot of ball games, each had its own rules. They began to play these ball

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young men to be brave(勇敢) and strong.   

1. ____, so the Egyptians invented balls instead.

A. Throwing stones was a popular game for children  

B. Stones were too heavy to throw

C. Stones might hurt children        

D. They hadn't so many stones

2. They preferred playing balls than throwing stones because ____.

A. balls were lighter than stones    

B. they were looking for something

C. balls were easy to make        

D. throwing stones was more dangerous

3. They made the first balls with ____.

A. leaves and vines    

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C. something light  

D. something better

4. The Egyptians invented ____ very long ago.

A. many different kinds of games    

B. many different games with balls

C. throwing stones                

D. dangerous games

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B. would make the young people healthier

C. could be more interesting

D. could be the best way to study well

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