Passage One
[26]We don't know how the first fire was made. Early fires on the earth were certainly caused by nature, not by man. Some were caused by lightning in a storm; others, perhaps by one hot material which came out of a volcano. Quite possibly, at times, the heat of the sun set light to some dry grass or leaves. [27]At first, man, like other animals, was probably afraid of fire. He saw that fire could destroy a forest; he knew that fire could hurt his body. So great was the power of fire that he feared it and worshipped it. Gradually, however, with his better powers of thinking, he overcame his fear. Probably he overcame most of his fear when he discovered how to make fire for himself. Throughout the ages he has learned more about fire, how to control it, and how to use it in many ways. Now fire is no longer a master or a god, it is a servant. Again, at some early date, man found how fire could be used to make certain metals from rocks. [28]Some time later, he found out how to make the metal which we now call bronze. This is a mixture of copper and tin. Bronze was a very useful metal. It was hard and tough, but he could shape it by hammering (probably with heavy stones). He could make a tool with a sharp edge for cutting. It isn't so easy to get iron from its ore and this metal was probably not discovered until very much later.

答案解析：
Questions 26 to 28 are based on the passage you have just heard.
26. What do we know about early fires on the earth?
[C]解析：短文開頭即說：“第一堆火是怎樣生起來的，我們無從知道。地球上早期的火肯定是由大自然而非由人引燃的。”C正確。段落開頭處... certainly caused by... not by... 的鮮明的對比關系與語義上的強調特色，應能使我們準確答題。
27. What was probably man's response to the first fire?
[A]解析：短文說，最初，人類和其他動物一樣很可能也怕火。A正確。At first引導的語義強調之處出題，四個選項都為表示心理活動的形容詞，聽到什么選什么。
28. What is bronze made of?
[B]解析：短文提到：“過了一些時候，人類知道了如何制造我們現在稱之為青銅的東西。青銅是銅和錫的合金。”B正確。具體的物質名詞選項，表明本題問細節而非大意。選項是由幾個關鍵詞的不同組合構成的，聽到相關內容做好標記則必然得到正確答案。聽到什么選什么。