题目

--- Jack didn’t come back early last night, did he? ---_____. It was not yet eight o’clock _____ he arrived home.        A. No; before B. Yes; when      C. Yes; that        D. No; until 答案：B 如图是物质A和B在不同温度时的溶解度及其溶解度曲线温度/℃2030506080溶解度/gA110114121126139B31.645.885.5110169回答下列问题：（1）图中表示B物质溶解度曲线的是　　（填“甲”或“乙”）．（2）曲线上M点的含义是　　．（3）温度t1介于　　℃之间．