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一、题文

"Warm water freezes (结冰)more quickly than cold water,"Sir Francis Bacon said that almost four hundred years ago, but few people believed him until 1970. In that year the Canadian scientist George Kell proved the English physicist was right. Dr. Kell filled (装满) one open bowl with cold water, and another with warm water. He put both bowls under the same low temperature. The warm water froze first. The lack (缺少)of covers on the bowls is the secret. Some of the warm water changes into vapour (水蒸气). It evaporates into the air. This means that less of the warm water is left to freeze, so the warm water freezes faster than the cold water. ( )1.Sir Francis Bacon was_ A.an American scientist B.a Canadian physicist C.aFrench scientist D.an English physicist ( ) 2.Most people didn"t believe that warm water A.freezes more quickly than cold water B.Is quicker to evaporate(蒸发)than cold water C.is able to flow faster than cold water D. Is a little harder than cold water ( ) 3.The second paragraphtells us why A.Sir Bacon and Dr. Kell were studying water together B.there is a secret inside the water C.water freezes in winter D.warm water freezes first ( )4.Warm water can"t freeze faster if the bowls are_ A.full B. covered C.put outside D.changed

二、解答

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