While building a tunnel through the mountains,        .

       A. an underground lake was discovered

B. there was an underground lake discovered

C. a lake was discovered underground

D. the workers discovered an underground lake

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A series of books _______translated into English.

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Foods quickly spoil and break down if they are not stored correctly. Heat and damp encourage an increase of micro-organisms (微生物) ,and sunlight can destroy the vitamins in such foods as milk. Therefore, most foods should be stored in a cool, dark, dry place.

Some foods go had quickly, such as meat, eggs, and milk. They should be stored in a refrigerator or in the underground basement of a house.

Dry goods, such as flour and rice, should be kept a slightly higher temperathure than foods that go bad quickly. A temperature of 15℃ is ideal (理想的). In Britain and northem European countries this means that the room in which dry goods are stored should share the general heating of the house. The room should also be well aired and, above all, dry. Damp very quickly causes the growth of the green molds (霉) . These molds often grow on cheese if it is not stored properly.

Fruits and vegetables need cool, damp, but frost-proof (防霜凍的) conditions. Therefore, an underground basement usually makes an excellent storage place. If the central heating until is located in the basement, however, it will not be ideal unless the unit and the pipes do not give out any heat.

Foodstuffs (食料. 糧食) do not break down quickly. If correctly stored, they should keep for quite long periods of time. Thus, salt and sugar will keep for about two years; tinned meat goods, such as beef and chicken, for about eighteen months; flour and other dry goods, for about a year. Freezing the foodstuffs that spoil easily preserves them for much longer than is otherwise possible. But even frozen foods do not keep their food value of their taste for ever. As a general rule, meat should be cooked and eaten within a year afrer it is frozen; fish, within six to ten months; fruits and vegetables, within three to six months.


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