E篇：一篇科技类说明文，主要讲述了Daylight
　　 Saving Time(DST)制度。题目设置上，72、73、74均为细节题，75为主旨大意题。
　　73. According to the text, which state was the last to use DST?
　　A. Victoria. B. Queensland.
　　C. South Australia. D. New South Wales.
　　【解析】解这道题需要综合文中出现的所有信息。根据文中“In 1972, New South Wales, South Australia and Victoria joined Tasmania for regular daylight saving, but Queensland did not do so until 1989”这条信息，答案一目了然，选B。

75. What do we know about the use of DST from the last paragraph?
　　A. There exist some undesirable effects.
　　B. It helps little to save energy.
　　C. It brings about longer working days.
　　D. Radio and TV programs become different.
　　【解析】最后一段讲述的是在交通运输和其他社会活动方面，由于DST的不同而造成的一些严重问题。所以，这里A项是最佳答案。其实解一段或者全文的主旨大意题，关键在于抓该段的首句和尾句或全文的首段末段。