—Oh, really? Have you got any valuable idea?
A:which
B:who
C:what
D:why
B: During the first days of the Spring Festival holiday, pollution levels aren't ____ ____ ____ they were last year.
请回答下列问题:
(2015•德阳)某研究性学习小组利用如图装置探究温度对CO还原Fe2O3的影响(固定装置略).
查阅资料:CO2+ZnCO+ZnO;FeCl3溶液遇KSCN溶液变红.
下表列出了KNO3在不同温度下的溶解度.