题目

下列物质可用于自来水厂原水的消毒，但又不会造成环境污染的是A、液氯 B、臭氧  C、酒精D、醋酸  答案：B解析: There ____ quantities of apples in the basket and there was _____ milk in the bottle.A．were; a number ofB．was; quantities ofC．was; a good manyD．were; a quantity of