题目

如图是某种晶体的熔化图象，下列说法中正确的是( ) A . ab段是吸热过程，cd段是放热过程 B . ab、bc、cd三段都是吸热过程 C . ab段物质处于固态，bc和cd两段处于液态 D . bc段是晶体熔化过程 答案：B,DHe took pity on the people in the flooded areas and ____his clothes and quilts to them.   A gave away   B gave off  C sent out  D threw away