题目

Through the open window we saw on the floor the happy father lying ________ his stomach, his daughter riding excitedly on his back. A. on          B. with                 C. above                D. from 答案：A 解析: 略自古以来就有鸿雁传书、飞鸽传信等通讯方式，这是利用了动物的A.迁徙行为B.先天性行为C.学习行为D.非条件反射