水结冰时体积就膨胀。 （expand，freeze）

________________________________________

Warm water freezes（结冰） 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.
【小题1】Hundreds of years ago, Sir Francis Bacon found _______.

Warm water freezes（结冰） 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.

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.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 ago                     D. late in the 20th century

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.

4.Why does warm water freeze first in the same freezing weather?

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

介绍我国去年冰灾的情况
写一封英语电子邮件给外国友人，介绍我国去年冰灾的情况：
今年过去的冬天对于所有中国人来说都是难忘的。来自大自然的巨大挑战使到许多中国人有家难归。到处冰雪封路，无数车辆困在高速路上，不少人饥寒交迫。但在这期间，我们的政府努力帮助被困人们。百姓也团结互助，一起共度难关。彼此都感到了“天寒心不寒，天冷人不冷”的温暖。有了这种一起奋战的精神，我们中国人一定能不断走向成功并创造更多的成绩。

介绍我国去年冰灾的情况

写一封英语电子邮件给外国友人，介绍我国去年冰灾的情况：

今年过去的冬天对于所有中国人来说都是难忘的。来自大自然的巨大挑战使到许多中国人有家难归。到处冰雪封路，无数车辆困在高速路上，不少人饥寒交迫。但在这期间，我们的政府努力帮助被困人们。百姓也团结互助，一起共度难关。彼此都感到了“天寒心不寒，天冷人不冷”的温暖。有了这种一起奋战的精神，我们中国人一定能不断走向成功并创造更多的成绩。