2. 外语
  3. To preserve food, the growth of bacteria (细菌) must be controlled. Water, warmth, and food are all needed for bacteria to become

To preserve food, the growth of bacteria (细菌) must be controlled. Water, warmth, and food are all needed for bacteria to become

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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.
Cooking is an effective way in preserving foods because      .
选项 A、cooking always kills the bacteria in food
B、cooking can make the food become dry
C、the light in cooking can kill bacteria
D、under the right conditions, cooking will kill bacteria
答案D
解析 根据题干中的关键同Cooking定位到第三段第一、二句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.可知，如果温度够高时间够长的话，烹饪法通常能够杀死细菌。某些烹饪方法能去掉食物的水分，这也有助于保存食物。因此，在一定的条件下(如果温度够高时间够长的话)，烹饪法能保存食物、
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