单项选择题

Questions 8 to i0 are based on the following conversation. At the end of the conversation; you will be given 15 seconds to answer the questions. NOW listen to the conversation. How did the woman learn about the process she describes

A．She was doing research for a paper on it.
B．She read a newspaper article about it.
C．She was told about it by her roommate.
D．She heard about it in class.
<上一题 目录 下一题>
热门 试题

单项选择题
What was the woman’s problem
A．She felt embarrassed in class.
B．Her presentation received a poor grade.
C．She had not completed her assignment.
D．She was unable to attend her psychology class.
问答题
[听力原文]Keep Food Cool Bacteria can make foods go bad. This is true of cooked foods as well as fresh foods. The problem is especially dangerous when the air around food is warm. High heat kills bacteria. But warm, wet conditions help bacteria grow. So, the best way to protect food is to keep it in a cool place. There are several ways to keep food cool without the need for electricity. Some refrigerators, for example, are powered by gasoline motors. There are less costly ways than refrigeration to keep food cool. An ice box is a simple device. It is made mostly of wood. The inside walls are covered with metal. A big piece of ice is placed in the bottom. Millions of homes had ice boxes until refrigerators became common in the 1940s. An ice box will keep food from spoiling for several days if the outside temperature is not too warm. If the box is kept out of sunlight, the ice will last longer. Probably the best method to keep food cool without electricity is a device called the evaporative cooler. Evaporation is the natural change of water from liquid to gas as the water mixes back into the atmosphere. An evaporative cooler is easy to make. And it does not need ice.
相关试题