湘少版六年级英语上册Unit13 I'm as happy as a bird. JackTimtallshortfatthinstrongweakJack is taller than Tim.Tim is shorter than Jack.Jack is fatter than Tim.Tim is thinner than Jack.Jack is stronger than Tim.Tim is weaker than Jack.(heavy)heavier than the heaviestTall fat strong clever Jim TomJim is as tall as Tom.Jim is ..