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The world is filled of many interesting s 1. . Some are unpleasant to our ears w 2. others are very pleasant to hear. In single day you probably hear hundreds of sounds. All sounds are d 3.. Some may be loud, some sounds are high, others are low, some sounds are useful.

W 4. sound we can’t talk or listen to each other. The ringing of the alarm clock wakes people up. The hooting（鳴笛聲）of a car warns people of d 5. .Some sounds are harmful. When planes fly low over the land, the very loud sounds can damage ( 毀壞 ) the house. Very l 6. sound can even make people deaf.

We know sound travels about one kilometer in three seconds. In a thunder storm you see the lighting f 7. and then hear the thunder. This is because light travels much f 8. than sound. Next time you see lighting count the number of seconds before you h 9. the thunder. Divide this number by 3. This will tell you how m 10. kilometers away the thunder storm is.

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Telephone: 2123 1234

Website: www.saveourearth.org

E-mail: info@saveourearth.org

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