Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Humans, like other animals, interact through （ ） behavior by means of signs or symbols used conventionally. (communicate)
【正确答案】：COMMUNICATIVE
【题目解析】：
本题考查动词的形容词形式。
由behavior可知，空缺处应填形容词修饰名词，communicate的形容词形式是communicative意为“爱说话的，交际的”。
句意：同其他动物一样，人类通过常规的手势和符号来相互交流。