下列几种溶液既能检验CO2中SO2的存在,又能除去SO2的是[ ]
A.溴水
B.酸性KMnO4
C.饱和NaHCO3溶液
D.NaOH溶液
AB
What __________ they putting on the Christmas tree?[ ]
A. was
B. is
C. are
心脏:脉搏 正确选项为( )。
A.失恋:自杀
B.台风:洪灾
C.贫穷:内战
D.空气:风