单选题 When snow collects on top of a building during the winter, the weight sometimes weakens the construction and occasionally causes the roof to collapse.
【正确答案】 B
【答案解析】[解析] collect聚集，集合；melt溶化，溶解；accumulate堆积，积累；select选择，精选； scatter使分散，使散开。故答案为B。