题目

第二节： （共5小题；每小题2分，满分10分） 根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 71 Being angry doesn’t really solve much, but what people do when they feel angry is important. The goal is to calm down and try to solve what is bothering you. This is hard for some kids and adults, too. Instead of calming down, some kids might keep getting more and more upset until they explode like a volcano! 72 Their anger might be so strong that they lose control of their temper. They may act in ways unacc已知某溶液的：①体积；②密度；③溶质和溶剂的质量比；④溶质的摩尔质量，要根据溶质的溶解度计算其饱和溶液的物质的量浓度时，上述条件中必不可少的是（    ）A．①②③④　　　  B．①②③       C．②④    　　　D．①④