(单选题)

47. （）

A.socializing

B.specialized

C.having specialized

D.specializes

参考答案：B

参考解析：

考查非谓语动词和上下文语境。句意：这是鸣禽类特有的，鸡类就没有这个特点。socializing意为“社交，specialized意为“专业的，专门的”。根据后面的“you don’t find in things like chicken”可知，46空说的事实只有songbirds才有，是它们特有的，普通的鸡是没有的，所以这里选择形容词specialized。故选B。

知识点：有选项完形填空英语专业基础知识完形填空教师招聘-小学英语

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47. （ ）

47. （）