【答案与解析】本文介绍热水比冷水结冰快的现象。
1. A。细节题。据第1句和第2句可知答案为A。
2. A。细节题。根据 But few people believe him until 1970 可知答案为A。
3. B。细节题。根据文章第1句可得出答案为B。
4. A。推断题。根据 Some of the warm water changed into vapor. This meant that less of the warm water was left to be frozen 可知答案为 A。
