题目

There were three little butterfly brothers, one white, one red and one yellow. They played among the ____ in the garden, but never grew ____ because they were so happy.One day there came a heavy rain, and it ____ their bodies. They flew away home, but when they got there they found the door locked and the key gone. So they flew to the tulip(郁金香) and said, “My dear friend, will you let us stay here till the ____ is over?”The tulip answered, “Only the red butterfly and the yellow one may ____ , because they are like me.”But the red butterfly and the yellow one said, “If our ____ 据图回答（1）鲫鱼的身体呈_______型，有利于_______________。（2）图中1为_______,4为________5为________7为_______8为__________（3）图中6是_________，其作用是____________________。鲫鱼和萤火虫的结构上的本质不同__________。（4）鲫鱼的呼吸器官是_________,位于[____]__________的里边。