Warm water freezes(結(jié)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 a Canadian scientist George Kill proved the English professor was right. Dr Kill filled an open oil pail(桶) with cold water. He filled another with warm water. He put both in the same low temperature. The warm water froze first. The lack of covers on the pails is the secret. Some of the warm water changed into vapor. This meant that less of the warm water was left to be frozen. And so the warm water froze faster than the cold water even though it had a greater temperature drop to make.
小題1:Hundreds of years ago, Sir Francis Bacon found _______.
A.the temperature of warm water drops faster than that of cold water
B.warm water is heavier than cold water
C.warm water has the same temperature as cold water
D.warm water is not as useful as cold water
小題2:What Sir Francis Bacon said was right, but people didn't believe him until _______.
A.late in the 19th centuryB.early in the 20th century
C.three years agoD.late in the 20th century
小題3:Leave a pail with warm water and another pail with cold water in the same low temperature, you’ll find that _______.
A.cold water freezes first
B.warm water turns into ice before cold water
C.warm water and cold water freeze at the same time
D.much of cold water is changed into air.
小題4:Why does warm water freeze first in the same freezing weather?
A.Because some of the warm water turns to vapor, the amount(數(shù)量) becomes less than that of cold water.
B.Because warm water is lighter than cold water.
C.Because the temperature of warm water is lower than that of cold water.
D.Because cold water freezes with more difficulty than warm water.

小題1:A
小題2:D
小題3:B
小題4: A

試題分析:
小題1:A 細節(jié)題。根據(jù)1,2行Warm water freezes(結(jié)冰) more quickly than cold water. Sir Francis Bacon said that almost four hundred years ago.說明A正確。
小題2:D 細節(jié)題。根據(jù)第2行But few people believed him until 1970.說明直到20世紀70年代,即20世紀后半期人們才相信。故D正確。
小題3:B 細節(jié)題。根據(jù)4,5行He put both in the same low temperature. The warm water froze first.說明B正確。
小題4:A 細節(jié)題。根據(jù)5,6行Some of the warm water changed into vapor. This meant that less of the warm water was left to be frozen.說明A正確。
點評:本文解釋了為什么熱水比冷水更快結(jié)冰的原理。集中考查了細節(jié)題,在解答這類問題時要求學生抓住題干文字信息,采用針對性方法進行閱讀,因為這類題的答案在文章中可以直接找到。
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