A:标准状况下5.6L氢气
B:4℃ 时9mL水
C:11g CO2
D:6.02×1022个H2SO4
数列{an}中,对任意n∈N*,a1+a2+…+an=2n﹣1,则a12+a22+…+an2等于( )
— What did you do last vacation?
— I ______ at home.