Documents Characteristics of sound,teacherpres,ppt

1. WHAT AM I? 2.   3.   4. Is there a relationship between the amplitude of sound and the loudness of sound? 5. Loudness and amplitude of sound is directly proportional…

Documents Suggested Answer Key (Ex. 1a) When is Halloween? (31st October) Where is it celebrated? (Britain)...

Unit 5c Grammar in use Suggested Answer Key (Ex. 1a) When is Halloween? (31st October) Where is it celebrated? (Britain) What do people wear? (masks and costumes) What do…