熔剂
参考答案：
一种与杂质进行反应生成熔点低、比重小的物质（即炉渣）进而除去杂质，我们把这种物质叫做熔剂。
It was generally believed that the show was not as successful as expected, but ________,
I think it was a great success. [ ]
A. personally
B. directly
C. publicly
D. secretly
后肾管
