更多"FREEZING FOOD 1 The discov"的相关试题:
[单项选择]
FREEZING FOOD
1 The discovery of freezing has changed our eating habits more than any other related invention. Because many foods contain large amounts of water, they freeze solidly at or just below 32 degrees Fahrenheit. When we lower the temperature to well below the freezing point and prevent air from penetrating the food, we retard the natural process of decay that causes food to spoil. Freezing preserves the flavor and nutrients of food better than any other preservation method. When properly prepared and packed, foods and vegetables can be stored in the freezer for one year.
2 Most vegetables and some fruits need blanching before they are frozen, and to avoid this step would be an expensive mistake. The result would be a product largely devoid of vitamins and minerals. Proper blanching curtails the enzyme action, which vegetables require during their growth and ripening but which continues after maturation and w
A. To suggest the storage temperature for most foods
B. To identify the freezing point of water
C. To state the correct setting for a freezer
D. To give the temperature for blanching
[单项选择]FREEZING FOOD
The discovery of freezing has changed our eating habits more than any other related invention. Because many foods contain large amounts of water, they freeze solidly at or just below 32 degrees Fahrenheit. When we lower the temperature to well below the freezing point and prevent air from penetrating the food, we retard the natural process of decay that causes food to spoil. Freezing preserves the flavor and nutrients of food better than any other preservation method. When properly prepared and packed, foods and vegetables can be stored in the freezer for one year.
Most vegetables and some fruits need blanching before they are frozen, and to avoid this step would be an expensive mistake. The result would be a product largely devoid of vitamins and minerals. Proper blanching curtails the enzyme action, which vegetables require during their growth and ripening but which continues after maturation and will lead to decay unless it is almost entirely stopped by blanching
A. To suggest the storage temperature for most foods
B. To identify the freezing point of water
C. To state the correct setting for a freezer
D. To give the temperature for blanching
[单项选择]Because the process of freezing food consumes energy, many people keep their electric freezers half-empty, using them only to store commercially frozen foods. Yet freezers that are half-empty often consume more energy than they would if they were kept fully stocked.
Which of the following, if true, contributes most to an explanation of the apparent discrepancy described above ？（）
A. A given volume of air in a freezer requires much more energy to be maintained at a temperature below freezing than does an identical volume of frozen food.
B. The more often a freezer’s door is opened, the more energy is required to maintain that freezer’s normal temperature.
C. When unfrozen foods are placed in a freezer, the average temperature of a given volume of air inside that freezer rises temporarily.
D. A person who normally maintains a half-empty freezer can cut energy costs considerably by using a freezer that is 50 percent smaller.
E. An electric freezer can operate efficiently only if chilled air is free to circulate within the freezing compartment.
[填空题]The discovery of sulfa drugs, like the discovery of penicillin ______ (come) out by accident.
[单项选择]Food prices
A. will not rise this year.
B. will fall down till the new year.
C. will rise up until after the new year.
D. will hold down not until the new year.
[填空题]Freezing weather can mean (36) and hypothermia unless a person is prepared. Thus, how to stay warm, dry and safe are very important. Frostbite damages that happen when skin is exposed to extreme cold for too long. It mainly happens on the hands, feet, nose and ears. People with minor cases of frostbite that affect only the skin may not suffer any (37) damage. But if deeper tissue is affected, a person is likely to feel pain every time the area gets cold. If blood (38) are damaged, people can suffer a gangrene infection. Sometimes the only way doctors can treat an injury like this is to remove frostbitten areas like fingers and toes. (39) is a condition that develops when the body cannot produce as much heat as it releases. Hypothermia can lead to death if the person does not receive help.
To avoid cold-related injuries, here are some simple (40) to remember. Think of COLD—C. O. L. D. The C (41) for cover. Wear a h
