第4课

Unit 2第二单元

The Secret of Sound声音的秘密

1.Rain and sand, moistening the growth of all things小雨沙沙，滋润万物生长

2.The stream gurgled and ran to the river and sea.小溪潺潺，奔向江河海洋。

3Birds chirp and sing in the woods.小鸟喳喳，在树林里嬉戏歌唱

4.Singing bursts, beautiful melody floating in the air.歌声阵阵，优美的旋律在空中飘荡。

5.In the world of sound, let us insert the wings of inquiry在声音的世界里，让我们插上探究的翅膀……

4 Sound generation声音的产生

1. The sound of the book, the sound of the piano melodious, singing loud and clear.书声眼琅，琴声悠扬，歌声嘹亮.....

2. How do these sounds come into being?这些声音是怎样产生的?

3. Material package材料包

4. steel ruler, plastic bottle, candle, etc.钢尺、 塑料瓶、蜡烛等。

5. Activity process活动过程

6. What voices are there in life? 生活中有哪些声音?

7. I heard the sparrow's cry.我听到了麻雀的叫声。

8. I heard...我听到了......

9. How does the sound arise? 声音是怎样产生的?

10. The sound may be produced with...声音的产生可能与......

11. Thinking Navigation思维导航

12. What is the phenomenon of the water by inserting the vocal fork in the water? 把正在发声的音叉插入水中，水面有什么现象?

13. What is to explain? 说明什么?

14. What is the phenomenon when steel ruler, water, air and other articles sound?钢尺、水、空气等物品发声时分别出现了什么现象?

15. What are the common features of these phenomena?这些现象有什么共同特征?

16. Inquiry skills探究技能

17. According to the tuning fork, water, air and other sound in the vibration phenomenon, the conclusion that the object will vibrate when the sound, is summed up.根据音叉、水、空气等发声时都在振动的现象，得出物体发声时会振动的结论，就是在归纳。

18. How to make the vocal object stop?怎样让发声的物体停止发声?

19. Sound is produced by the vibration of an object.声音是由物体振动产生的。

20. Does the sound have the energy? 声音具有能量吗?

21. What is the change of the candle in the drum flame? 敲击鼓面，蜡烛的火焰有什么变化?

22. The sound was so loud that my ears hurt. 声音太大了，震得我耳朵疼。

23. Outreach activities拓展活动

24. Listen to the sound around you and find what vibrvibrate. 听一听周围的声音，找一找是什么物体发生振动产生的。