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问题 填空题

一种精密零件按50：1的比例尺画在图纸上的长度是20厘米，这种零件长______．

答案

20÷50=0.4（厘米），

答：这种零件长0.4厘米．

故答案为：0.4厘米或4毫米．

阅读理解

阅读理解。

     Do you want to be a musician?Come to our club, and you'll be very happy in the club.We have lessons about the piano, the drums, the bamboo flute, the guitar and the violin for just $20 each. You can also

learn to sing, to dance for $25 each. If you like art, you can be satisfied, too. -It's just for $30 each!

1. How many kinds of instruments are there in the ad?There are_______.

A. 4

B. 5

C. 6

2. How much is it for piano? It's_______.

A. $25

B. $20

C. $30

3. We can't learn about_______ in the club.

A. drums

B. bamboo flute

C. chess

4. If you want to learn about guitar and singing, you should pay_______.

A. $45

B. $20

C. $30

5. What does "lesson”mean in the ad?_______.

A. 教师

B. 课本

C. 课程
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填空题

（1）图1中，工人们把汽车向山上推拉时，对汽车（包括绳子）作用力的三要素中，一定相同的是____________ ；

（2）图2中电线着火的原因是__________________________；

（3）图3中，抛出的小球在空中运动状态发生变化的原因是______________的结果；

（4）说明图4中谁分的萝卜多并阐述理由：___________________________________。

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