第8题: [单项选择]平均增长量是时间序列中()的序时平均数。 A. 累计增长量 B. 报告期水平与某一固定时期水平(通常是时间序列最初水平)之差 C. 逐期增长量 D. 报告期发展水平 参考答案:C 答案解析:平均增长量是时间序列中逐期增长量的序时平均数。
第9题: [单项选择]What does the man mean A. He agrees with the woman. B. He prefers to travel by ship. C. He doesn’t quite agree with her. 参考答案:C 答案解析:[听力原文] M: Traveling by train is the safest way to travel. M: I’m not so sure about that.
A. widespread concern over its harmful effects B. great panic over the mental disorder it could cause C. an intensive research into stress-related illnesses D. popular avoidance of stressful jobs 参考答案:A 答案解析:根据文章第二段第二句“…millions of Americans…worried over the reports.”数百万工作和生活在压力之下的美国人对这些研究报告非常担心,而这些研究归结出一个信