单选题
【正确答案】 B
【答案解析】[听力原文]32-35
In the old days, fresh food had to be eaten in the city no more than one or two days after it left the farm. If kept longer, it would spoil. One of the reasons behind it is that the air contains many living things that can harm our food. Some things, such as insects, can be seen by us. Others, like bacteria, can be seen only with a microscope.
All living things need water and man discovered that if this water is removed, the activity of the bacteria which causes food to go bad is prevented. In other words, we can protect some of our food by drying it. 'Besides, living things can only grow at certain temperature's, so we can also protect our food by heating or cooling it.
A New York man had an idea. He filled a wooden rail- road car with tons of butter. The car was hooked to a train and pulled from New York to Boston. How could this be done? The butter was packed in ice, and twice during the trip more ice was added. This was the first refrigerator ear. As a matter of fact, People also used wooden boxes filled with ice to keep their food. Now we have mechanical refrigerator cars and mechanical refrigerators at home and stores and other places that need them.
32. In the old days, in order to avoid eating spoiled food, what was done?

[试题分析] 本题考查考生对细节的理解。
[试题详解] 过去人们为了避免吃变质了的食物,一般在新鲜食物运离农场的一两天之内将食物吃掉,故选B。
【正确答案】 D
【答案解析】[听力原文]
Which of the following ways is not mentioned as a way to protect food?

[试题分析] 本题考查考生对文章细节的掌握。
[试题详解] 文章中提到了三种保存食物的方法:干燥,加热或冷冻,故选D。
【正确答案】 C
【答案解析】[听力原文]
Why was the New York man's car hooked to a train?

[试题分析] 本题考查考生对文章细节的理解和推测。
[试题详解] 这个纽约人为什么要把他的车和火车挂在一起呢?因为他要尽快地把黄油从纽约运到波士顿。为了避免黄油变质,他在车上装了冰将黄油包装起来,这样黄油就能又快又好地运到目的地了,敢选C。
【正确答案】 A
【答案解析】[听力原文]
What does the passage mainly deal with?

[试题分析] 本题考查考生对全文主旨的概括。
[试题详解] 文章首先分析了食物变质的原因,接着提出了几种保存食物的方法,最后还举例进一步解释。因为本文主要介绍了几种如何将食物保存更长时间的方法,故选A。