Many animals communicate with special calls which have corresponding meanings but cannot be further divided into elements, so animals' calls cannot be called language. This reflects that language has the feature of ______.
 
【正确答案】 A
【答案解析】 动物的叫声不能称为语言，原因之一就是它们的叫声无法分解成更小的语言单位，这体现了语言的二重性，故选A。