✔ 最佳答案
Whales __are___(be) warm-blooded;their body temperature never_change___(change) .
Fish _live___(live) in water and _come___(come) in all sizes .Most__are__(be) much smaller than whales .Fish____are_(be)covered with thin,bony scales ,and have fins that are straight up and down.
When swimming , fish _move__(move) their fins from side to side . Fish breathe oxygen that _is__(be) dissolved in water . Fish are cold-blooded ;their body temperature__changes__(change)with the temperature of the .Most fish__lies_(lay) many eggs in the water at a time .