A:往AlCl3溶液中逐滴加入NaOH溶液
B:往Fe(NO3)2溶液中逐滴加入稀H2SO4
C:CO2通入饱和Na2CO3溶液中
D:往Ba(OH)2溶液中逐滴加入稀HCl溶液
3.121212是循环小数. .(判断对错)
—Why do you like winter best?
— I can sleep all day.