Why is a crow a brave bird

The crow is a bird 完形填空A crow is a common bird.It is about twenty inches long a 哪个正确?There is a bird （）in the sky. A.crow B.crows C.crowed D 哪个正确?There is a bird （）in the sky.A.crow B.crows C.crowed D. A Clever Crow A crow is thirsty .He finds a bottle with a li he is a brave man this is a bird —Leslie is really a brave boy. Why not a bird is flying duck 帮我翻译一下子, Is the bird still a () a bird 介词 tree a bird 介词 the branches 介词是什么 why? how brave lin tao is=what a brave young man lin tao is吗