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.
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[听力原文]Several Ways To Keep Food CoolBacteria can make foods go bad. This is true of cooked foods as well as fresh foods. The problem isespecially 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 call without the need for electricity. Some refrigerators，for example, are powered by gasoline motors. There are 1ess 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 is kept food cool spoiling for several days if the outside temperature is not too warn. If the box is kept out of sunlight，the ice Will 1astlonger. Probably the best method to keep food C001 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 tee.
单项选择题
The two scholars worked at the task of writing a preface to the new dictionary for three hours _____ last night.
A．at length
B．in full
C．on end
D．in time
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