下列哪项不属于引起心理疲劳的原因（）
A．工作单调、缺乏兴趣
B．人际关系紧张、精神负担重
C．困难较多、技能不熟练
D．工作强度大、时间长
参考答案：D
—If you want to sell your old house, why not put an _____in the newspaper?
—That sounds like a good idea. [ ]
A. e-mail
B. advertisement
C. article
D. advice
