煅后由FeS2生成FeS的药物是（）
A.自然铜
B.石决明
C.炉甘石
D.代赭石
E.磁石
参考答案：A
根据括号内的汉语提示,写单词完成句子。
1. She _____( 寄) a postcard to her mother yesterday.
2. Here is a map of ______( 欧洲).
3. I often swam in the ______( 湖) near my house when I was young.
4. My grandpa lives in the ______( 农村).
5. Jerry couldn't stand city life and went back to _______( 大自然).
氧气顶吹转炉炼钢法有什么优点？
