用CuSO4?5H2O配制0.1mol?L-1CuSO4水溶液,下面所列的方法正确的是( )A.取25g CuSO4?5H2O溶于1L水中B.将CuSO4?5H2O干燥去掉结晶水,取16g溶于水制成1L溶液C.将25g CuSO4?5H2O溶于水制成1L溶液D.取12.5g CuSO4?5H2O溶于500mL水中