(D) The average delivery time for a first-class letter four decades ago was actually slightly longer than it is today. 40年前平均邮递时间只比当今长一点点. 可否这样解释? 该选项中的"slightly"是不是"轻微"的意思啊? 如果这样的话(意思是:现在价格上涨了,而邮递时间却没明显减少,支持了主题啊?),和E选项差不多啊?E也说平均消费价格水平涨了3倍多(不是“才3倍”吧?虽然没有到10倍,但并不明显说明和10倍相差很大啊?)
(E) The average level of consumer prices overall has increased more than 300 percent over the last forty years.