A:2Na+2H2O=2NaOH+ H2↑
B:2Na2O2+2 CO2=2 Na2CO3+ O2
C:NaH+ H2O = NaOH+ H2↑
D:ICl+H2O=HCl+HIO (ICl中Cl为-1价)
下列属于生命现象的是( )
He worked all summer to save money for the____ (购买) of a piano.