单选题 A______refers to an animal that is born from its mother's body, not from an egg, and drinks its mother's milk as a baby.
【正确答案】 D
【答案解析】解析：句意：哺乳动物是指那些由母体胚胎而非卵所生且在幼仔期喝母体乳汁成长的动物。mammal“哺乳动物”符合题干描述。mammoth“猛犸象”，penguin“企鹅”，mosquito“蚊子”，均不符合句意，排除。