还原剂
参考答案：
就高炉冶炼过程来说，还原剂就是从铁氧化物中夺取氧，使铁氧化物中的铁变为金属铁或铁的低价氧化物的物质。
– Li Na won the tennis championship in the French Open on June 4, 2011.
– We ________ her. She is the first Asian professional tennis player to win it.
A．take pride of
B．be proud of
C．are proud in
D．take pride in
在连带责任保证中，主债务消灭或者不成立，则连带责任保证不存在。( )
