A. positive B. neutral C. suspicious D. critical 参考答案:D 答案解析:通读全文可知本文的主题是保护人自然，认为我们应该立即弥补前人的错误，节约利用自然资源，保护生态环境，很显然作者对当前的环境及资源保护的状况不满，所以作者对目前自然资源开采持[D]“批评的”态度。
A. are based on stimulus and response B. have no bearing on human drives C. are supposed to be highly motivated D. are of a great mystery 参考答案:A 答案解析:推理题 作者在谈到行为主义的基本原理就是“积极强化”(positive reinforcement)。接着，作者又举了许多行为主义基本原则中靠刺激和奖励(incentives and rewards
第26题: [单项选择]All the staff members of the department made ______ efforts to clean up the hall for the Christmas party. A. gigantic B. cohesive C. comprehensive D. conscientious 参考答案:A 答案解析:gigantic巨大的，庞大的The entire area looked like a gigantic rubbish, heap；cohesive有粘着力的；凝聚性的any cohesive u
