A:2
B:3
C:4
往无色溶液中滴加氯化钡溶液产生不溶于稀硝酸的白色沉淀,则无色溶液中( )
The bus got ________ in the snow and we had to walk the rest of the way.
胆汁由胆囊分泌,流入小肠后,参与脂肪的消化.