题目

B．用括号内所给词的适当形式填空（每空不限一词）。【1】It’s said that five people died in the car accident because of the driver’s________________ (careless).【2】—Why do you like this book so much?— Because of some powerful ___________________(speech).【3】The doctor devoted all the spare time he had to___________________ (help)the people in need.【4】Neither Jim nor the twin sisters ________________ (play) such exciting games before.【5】If you require strength in either body or mind, red may be of some _______________(helpful) to you.【6】It makes 下图是甲、乙、丙三种固体物质的溶解度曲线，据图回答下列问题。(1)0℃时，乙物质的溶解度是___________。(2)t1℃时，三种物质溶解度由大到小的顺序是___________。(3)t3℃时，将70g甲物质加到100g水中，充分搅拌后所得溶液的质量是______g。(4)t3℃时，将甲、丙两物质的饱和溶液同时降温至________℃,它们溶质的质量分数相等。