Question

【题目】 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】

这是一篇说明文。文章主要解释了为什么热水比冷水更快结冰的原理。

【1】细节理解题。根据文章第一句“Warm water freezes more quickly than cold water. Sir Francis Bacon said that almost four hundred years ago.”弗朗西斯·培根在大约四百年前说过，温水比冷水结冰快。由此可知，弗朗西斯培根发现温水的温度比冷水下降得快。结合选项，故选A。

【2】细节理解题。根据文章第五和第六句“He put both in the same low temperature. The warm water froze first.”他把两者都放在相同的低温下。温暖的水先结冰了。由此可知，把一桶温水和另一桶冷水放在相同的低温下，温水会在冷水之前结冰。结合选项，故选B。

【3】细节理解题。根据文章最后三句“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.”一些温水变成了水蒸气。这意味着可以冷冻的温水变少了。所以温水比冷水冻结的更快，即使它有更大的温度下降。由此可知，同样寒冷的天气里，温水会先结冰的原因是一些温水变成水蒸气，它的总量比冷水少。结合选项，故选A。