A:NaCl、HCl、H2O,NaOH
B:Cl2、Na2S,HCl、SO2
C:Na2O2、H2O2、H2O,O3
D:HBr、CO2、H2O,CS2
随着信息技术的突飞猛进,现代社会中人们获得知识的途径日益增多,如通过电脑、可视电视、接受远程教学等。因此,我们的学习( )
He's under stress because he has too much work to do.