体积为100cm3的冰熔化成水后,下列说法正确的是(ρ冰=0.9×103Kg/m3)( )
A:质量不变,水的体积为90cm3
B:质量变大,水的质量为100g
C:质量不变,水的体积为100cm3
D:质量变小,水的密度为1.0g/cm3
-- Is this your sweater?
-- Yes, it's. ____
His friends ______ at him two days ago.( )