Warm water freezes more quickly than cold. Sir Francis Bacon said that almost four hundred years ago. But few people believed him - till 1970. In that year Canadian scientist George Kell proved the English scholar was right. Dr. Kell filled an open pail with cold water. He filled another with warm water. He exposed both to the same low temperature. The warm water froze first.
The lack of covers on the pails was the secret. Some of the warm water changed to vapor. It evaporated into the air. This meant that less of the warm water was left to freeze. And so the warm water froze faster than the cold water --- even though it had a greater temperature drop to make.
1.Sir Francis Bacon was_______.
A.an American experimenter B.a Canadian scientist
C.an English scholar D.an Australian writer
2.Most people didn't believe Bacon because warm water is________.
A.somewhat heavier than cold water
B.able to flow faster than cold water
C.further from freezing temperature than cold water
D.quicker to evaporate than cold water
3.Dr. Kell's pails were both_________.
A.filled with water B.left uncovered
C.exposed to the same temperature D. All of the above
4.The second paragraph tells why________.
A.Dr. Kell was studying water B.the warm water froze first
C.Dr. Kell used pails in his work D.water freezes in underground pipes
5.No water vapor would have escaped into the air if the pails had been_______.
A. warmed B. covered C. shaken D. filled
6.The cold water froze more slowly because_________.
A.salt was added to it B.its pail was smaller
C.there was more of it left D.the air near it was moving
7.When the water was frozen, one of the pails must have had
A.less ice in it than the other B.more salt in it than the other
科目:高中英语 来源:2010年普通高等学校招生全国统一考试、英语(新课标全国卷) 题型:050
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