第13题:[单项选择]<br><br><br/>A.situations<br/>B.things<br/>C.affairs<br/>D.matters<br/>参考答案:B 答案解析:[解析] 本句意为:以前地球上的人很少,自然资源并不显得有限。但是现在情况不同了。things are different是“情况不同”的常见说法。
第20题: [单项选择]Questions 19 to 21 are based on the conversation you have just heard. A. When you’re always just about to do something. B. When you’ve just moved from this house to that house. C. When you actually get into a situation. D. When the circumstances do not change. 参考答案:A 答案解析:[听力原文] When is the "happiest time" to the woman