A:Si SiO2 Na2SiO3 H2SiO3
B:CH2=CH2 CH3CH2OH CH3CHO CH3COOH
C:Fe Fe(NO3)3 Fe(OH)3 Fe2O3
D:Al Al2O3 AlCl3 Al(OH)3
下列这些水中生活的动物中,哪一组都是无脊椎动物?( )
On my _____ birthday I got a computer from my parents.