When heated to temperatures above 1250 degrees of centigrade, clay fuses and becomes pottery or stoneware.
【正确答案】 B
【答案解析】解析:题干中fuse“熔化”,选项中burn off“烧掉”,melt together“熔化,混合在一 起”,steam up“布满水汽”,decay down“腐烂”,选项B最接近题干意思。