[单项选择]One characteristic of the rich classes of a declining society is their tendency to______


A. take in the recently wealthy
B. retreat within themselves.
C. produce publications on manners.
D. change the laws of etiquette,

进行量本利分析的主要问题是找出盈亏平衡点，寻找的方法有：①图解法。以y轴表示收入或费用，以x轴表示产量，绘成直角坐标图。②公式法。公式法可分为销售量计算法和销售额计算法。

M: Michael is supposed to be here by 8:00.
W: His wife said he left home at 7:40, so he won’ t here before 8:20.

此题为数字题。这类题型即使不让考生做简单的运算，也会有几个数字对考生的思想进行干扰。此题第一句话就已告诉了我们正确答案。