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  3. To preserve food, the growth of bacteria (细菌) must be controlled. Water, war

To preserve food, the growth of bacteria (细菌) must be controlled. Water, war

游客2024-07-03  38
问题     To preserve food, the growth of bacteria (细菌) must be controlled. Water, warmth, and food are all needed for bacteria to become strong and healthy. Some kinds of bacteria need air, but other kinds grow only when air is absent. Extremes of temperature, either hot or cold, can kill bacteria.
  Before electric ice boxes were invented, freezing and cooling were limited by the cold climate. In warmer regions, food was cooled by putting it in the shade, in cold water from the well, or in pits in the ground.
    Cooking will usually kill bacteria if the temperature is high enough and long enough. Certain methods of cooking remove water, and this aids in preserving food. Drying is the oldest and most common method of preserving food. Food can be dried by the sun, by heat or by combination of the two.
    Salt was used by many hunting people. When people began to cat vegetables, salt be came a needed part of their life. Salt helps to preserve food because it slows or stops bacteria growth. Other chemicals besides salt are used in preserving foot. Some people oppose the use of chemicals in food. They say that these chemicals may harm people if the chemicals can harm bacteria. [br] Which is the best one for preserving food in the following methods?
选项 A、Put the food ill a cold place.
B、Cook the food well.
C、Dry the food by sun.
D、It is not told.
答案 D
解析 本题问下列哪种保存食物的方法是最好的。纵览全文，我们发现这是一篇说明文。作者并没有加入自己的观点和评价。所以答案应该选D“没有提及”。
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