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Unit1Theworldofoursenses Whensomethingstimulatesreceptorsinasenseorgan thereceptorssendnerveimpulsesalongsensorynervestothebrain Yourbrainthentellsyouwhattodo Sensesarethephysicalmeansbywhichalllivingthingssee hear smell taste andtouch Section Reading Welcometotheunit Reading stepped to frightened that Walking footsteps her firmly toknow a 谢谢观看