题干
Some people often take ________ for granted ________ what is new is always better than what is old.
A：it; it
B：that; that
C：it; that
D：that; it
答案(点此获取答案解析）
C
2NH3的化平衡体系中，N2、H2、NH3的浓度分别为
，若起始时NH3有最大浓度，则起始时N2的浓度为（ ）