试题：
| 短文填空。根据课文原意填出空缺的单词。 |
| Metals are very important, so when using them we should know how they react with different 1 . Take iron used in electrical 2 for example, when heated in 3 , it will react slowly. When it is put together with water or 4 , there will be a 5 reaction. |
日常生活类阅读
2016-05-29
答案：
我来补答展开全文阅读