题目

No matter ________，he is always with his family at weekends. A . how busy he is B . how busy is he C . how is he busy D . how he is busy 答案：A物质的溶解常常伴随着一些变化，硝酸铵溶于水会引起溶液温度________，氢氧化钠溶于水会引起溶液温度________，氯化钠溶于水会引起溶液温度________．