问题 问答题

如图是探究“平面镜成像特点”的实验装置.

(1)用透明玻璃板代替平面镜进行实验的目的,是在观察到蜡烛A的像的同时,也能观察到______,巧妙地解决了确定像的位置和大小的问题.

(2)为便于观察,该实验最好在______(填“较亮”或“较暗”)环境进行.

(3)将蜡烛逐渐靠近玻璃板时,像的大小______(填“变大”、“变小”或“不变”).

答案

(1)实验时用透明玻璃代替平面镜,在察到蜡烛A的像的同时,也能观察到蜡烛B,便于确定像的位置,便于比较物像大小.

(2)蜡烛点燃时比较亮,在较暗的环境中,烛焰和环境的对比度比较大,烛焰的像会更清晰.

(3)蜡烛逐渐靠近玻璃板时,蜡烛大小不变,蜡烛像的大小不变.

故答案为:(1)蜡烛B;(2)较暗;(3)不变.

阅读理解

阅读理解。

     One of  Jim's feet was bigger than the other. "I can never find shoes for my feet," he said to his friend

Dick. "Why don't you go to a shoemaker (鞋匠)?" Dick said. "A good one can make you the right

shoes." "I've never been to a shoemaker," Jim said. "Aren't they expensive?" "No," Dick said, "some of

them aren't. There is a good one in our village, and he's quite cheap. Here's his address." He wrote

something on a piece of paper and gave it to Jim.

     Jim went to the shoemaker in Dick's village a few days later, and the shoemaker made him some

shoes. Jim went to the shop again a week later and looked at the shoes. He became angry and said to the

shoemaker, "You are a foolish (愚蠢的)man! I told you to make one shoe bigger than the other, but

you've made one smaller than the other."

1. Jim could not find right shoes because ______.

A. his feet were too big            

B. his feet were too small  

C. his feet were not the same size  

D. his feet were too fat

2. Jim ______ before Dick told him to do so.

A. tried to ask a shoemaker for help    

B. went to a shoemaker

C. didn't go to any shoemakers        

D. went to Dick's village

3. The shoes of the shoemaker in Dick's village were ______.

A. expensive  

B. cheap  

C. not cheap or expensive  

D. foolish

4. When Jim saw his shoes in the shop, he was ______.

A. pleased    

B. angry    

C. satisfied (满意的)  

D. mad

5. Who was foolish?

A. Jim  

B. The  shoemaker  

C. Both    

D. Dick

单项选择题 A1/A2型题