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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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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.

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