结合实验,下列说法不正确的是( )
A:①中溶液橙色加深,③中溶液变黄
B:②中Cr2O72﹣被C2H5OH还原
C:对比②和④可知K2Cr2O7酸性溶液氧化性强
D:若向④中加入70%H2SO4溶液至过量,溶液变为橙色
— Excuse me, have you seen _______ umbrella here?— Yes. Is it _______ beautiful blue one? I saw it here just now.
给下面的句子填上合适的关联词语。