填空题 This is equally true {{U}}of{{/U}} the solid called ice and the gas called steam. {{U}}Chemically{{/U}} there is no difference between the gas, the liquid, and the solid, all of {{U}}which{{/U}} {{U}}is{{/U}} made up of molecules with the formula H₂O.
A. of
B. Chemically
C. which
D. is