题目

Having too many friends is not always good. Maybe we should ______ a smaller, but closer group of friends. A. begin with       B. stick to     C. care for 答案：B下列几种动物行为中，属于先天性行为的是A．大山雀偷吃牛奶B．鹦鹉学舌C．黑猩猩搬木箱摘取香蕉D．母鸡孵卵