(45-47) 根據文章內容選出最佳答案      To make it easier to study animals, scientists havearranged all animals into classes. An animal calss is made up ofanimals that are the same in some important ways. There aremany animal classes, and each one has a name.      Here are four important ones.  Mammals: If an animal drinks milk when it's a baby and has hairon its body, it belongs to the mammal class.  Birds: If an animal comes out of an egg and has feathers on itsbody, it belongs to the bird class.  Fish: If an animal lives in water and has gills and scales on itsbody, it belongs to the fish class. Reptiles: If an animal is cold-blooded, egg-laying, with roughskin and always born on the land, it belongs to theclass of reptiles. 

arrange…into classes 將…分類 gill 鰓 feather 羽毛scale 鱗 lay 下蛋 rough 粗糙的
【題組】45. A lizard is an animal which comes out of an egg. It has nofeathers and its skin is rough. It might belong to the ____class.
(A) fish
(B) bird
(C) reptile
(D) mammal