A:Al3+、Ag+、HCO3﹣、Cl﹣
B:Mg2+、NH4+、NO3﹣、Cl﹣
C:Ba2+、K+、Fe3+、Cl﹣
D:K+、Na+、OH﹣、CO32﹣
某学生要在暑假去欧洲旅行,下面行程不可能的是( )
First, please read the ____ (introduce) of the book. Then tell me your opinion about it.