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  3. In Labrador, a country so cold that meat is preserved by freezing it outdoors, Clarence Birdseye came to notice that meat which

In Labrador, a country so cold that meat is preserved by freezing it outdoors, Clarence Birdseye came to notice that meat which

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问题     In Labrador, a country so cold that meat is preserved by freezing it outdoors, Clarence Birdseye came to notice that meat which was frozen on the coldest days had a better flavor than meat frozen at other times. Being curious, he studied preserved meat under the microscope and found that if meat was frozen quickly on a very cold day, ice crystals did not have time to form long needles and the meat cells were not damaged.
    Birdseye believed that if he could freeze other foods very rapidly, the same thing might happen. But, since there are not many days when the temperature drops 40 or 45 degrees below zero—even in Labrador—some way had to be found to freeze things rapidly without depending on the weather. Remembering that salty water can get very cold without freezing, Birdseye placed some cabbages in salty water and then exposed them to freezing winds. The cabbages froze quickly.
    Later, Birdseye invented a machine to freeze food while they were very fresh. Today, stores sell a great variety of frozen foods, and some foods that were once available only in certain districts or in season are now readily available in most communities(社区)in any season.
To freeze foods quickly, Birdseye experimented with ______.
选项 A、a microscope
B、meat in salty water
C、meat in freezing winds
D、cabbages
答案D
解析
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