— Someone wants you on the phone.— _______ nobody knows I am here.
A:Besides
B:And
C:But
D:So
甲、乙两个实心金属球,密度之比ρ甲∶ρ乙=2∶5,质量之比m甲∶m乙=1∶2,那么甲乙两球的体积之比V甲∶V乙为( )