单项选择题
A.东方铃蟾B.花背蟾蜍C.北方狭口蛙D.金线蛙
A.大天鹅-鸿雁-绿翅鸭-斑嘴鸭B.绿翅鸭-斑嘴鸭-鸿雁-大天鹅C.大天鹅-鸿雁-斑嘴鸭-绿翅鸭D.绿翅鸭-鸿雁-斑嘴鸭-大天鹅
A.长耳鸮B.普通鵟C.雀鹰D.斑头雁