Question

【題目】 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.

【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

【2】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.

【3】Why does warm water freeze first in the same freezing weather? _______

A.Because some of the warm water turns to vapor, the amount 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.

Answer 1

【答案】

【1】A

【2】B

【3】A

【解析】

這是一篇說明文。文章主要解釋了為什么熱水比冷水更快結(jié)冰的原理。

【1】細(xì)節(jié)理解題。根據(jù)文章第一句“Warm water freezes more quickly than cold water. Sir Francis Bacon said that almost four hundred years ago.”弗朗西斯·培根在大約四百年前說過，溫水比冷水結(jié)冰快。由此可知，弗朗西斯培根發(fā)現(xiàn)溫水的溫度比冷水下降得快。結(jié)合選項(xiàng)，故選A。

【2】細(xì)節(jié)理解題。根據(jù)文章第五和第六句“He put both in the same low temperature. The warm water froze first.”他把兩者都放在相同的低溫下。溫暖的水先結(jié)冰了。由此可知，把一桶溫水和另一桶冷水放在相同的低溫下，溫水會(huì)在冷水之前結(jié)冰。結(jié)合選項(xiàng)，故選B。

【3】細(xì)節(jié)理解題。根據(jù)文章最后三句“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.”一些溫水變成了水蒸氣。這意味著可以冷凍的溫水變少了。所以溫水比冷水凍結(jié)的更快，即使它有更大的溫度下降。由此可知，同樣寒冷的天氣里，溫水會(huì)先結(jié)冰的原因是一些溫水變成水蒸氣，它的總量比冷水少。結(jié)合選項(xiàng)，故選A。