密闭容器中装有100g水，若将它冷却后全部凝固成冰，则水凝固成冰的质量                                                   （     ）

A．变大

B．变小

C．不变

D．无法确定

28. We have gathered nearly 100,000 quilts, ____ up to half have gone to the flooded-hit areas.

A．of which

B．in which

C．with which

D．for which