题目

He was once turned down by a primary school for lack of ____ practical teaching experience. But now he has turned out to be one of ____ best teachers in the city.    A a, a              B ∕, the             C the, the           D a, the 答案：B影响人口合理容量最重要的因素是（　　） A、自然环境和资源的优劣B、地域的开放程度C、科技水平D、社会经济发展水平