Warm water freezes 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 century B．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
文章向我們介紹了一種古老的理論：熱水比冷水結冰更快的。并解釋了原因—熱水的水蒸氣帶走了部分熱水，剩下的熱水變老了，這才是熱水比冷水結冰更快的原因。
小題1:A 推理題。文章第一句Warm water freezes more quickly than cold water.溫水比冷水更快結冰，熱水的溫度比冷水的溫度要高，而結冰的時候都是零度了，這說明熱水的溫度降的更快。故A正確。
小題2:D 細節(jié)題。根據(jù)文章第二行But few people believed him until 1970.人們直到20世紀70年代才相信這個理論。20實際70年代屬于20世紀的晚期，故D正確。
小題3:B 細節(jié)題。根據(jù)文章4,5行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.說明溫水更快結冰，那么是在冷水結冰之前就結冰了，故B正確。
小題4:A 細節(jié)題。根據(jù)文章倒數(shù)3,4行Some of the warm water changed into vapor. This meant that less of the warm water was left to be frozen.說明部分熱水變成了水蒸氣，留下的熱水變少了，這才是熱水比冷水結冰更快的原因。故A正確。
點評：科技類說明文一直是高考中必考內容，本文相對比較簡單，生詞較少，難度較小，此類文章不要有畏難心理。對于那些生詞，不要畏懼，因為對答案都沒有影響。
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