A:选举权和被选举权
B:公民的政治自由权
C:基层民主自治权
D:公民行使监督权
— Don't step on grass, Mike.
— _______________.
There is a ten-minute break between the classes.
现有NH4Cl、MgSO4、(NH4)2SO4和NaCl四种无色溶液,用一种试剂就可将它们鉴别出来,这种试剂是( )