Unit 1 The world of our senses,When something stimulates receptors in a sense organ，the receptors send nerve impulses along sensory nerves to the brain.Your brain then tells you what to do.,Senses are the physical means by which all living things see，hear，smell，taste，and touch.,Section Reading () (Welcome to the unit & Reading),stepped,to,frightened,that,Walking,footsteps,her,firmly,to know,a,谢谢观看,
