物质X可发生下列所示的两个反应,则X可能是( )
①X+碱→盐+ H2O ②X+金属氧化物→盐+ H2O
A:CaO
B:CO2
C:NaOH
D:H2SO4
People in North China eat noodles as their main food ___ people in the south eat rice.
下列国家与我国既陆上相邻、又隔海相望的是( )
面对不健康的文化,我们应该怎样做?