如图是某同学根据多次实验绘制的两种固体物质的溶解度曲线．该同

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问题多选题

如图是某同学根据多次实验绘制的两种固体物质的溶解度曲线．该同学对此得出如下结论，你认为错误的是（　　）

A．20℃时，甲、乙两种饱和溶液的溶质质量分数相等

B．30℃时，100g甲的饱和溶液中含有30g甲物质

C．10℃时，乙的溶解度大于甲的溶解度

D．从乙的水溶液中得到乙晶体的方法是冷却结晶法

答案

改错题

短文改错。

Many students are now facing with problems like deciding whether to focus on science or art. Not

taking the children's interest or preferences in account, some parents force their children to make the

choice as their will, that troubles many students.

Throughout our lives we have to make much choices. As students, we should talk to our parents

or teachers especial on life-changing decisions. But when it came down to it, we're the ones who must

live with their choices. On the other hand, parents should try to help their children make the best possible

decisions, instead forcing them to do something that against their will.

It depends on students themselves whether they'll be science students and arts students. Just let their

hearts show them the way.

选择题

在人类的进化过程中，最早用火并开始狩猎的是（　　）

A．智人

B．能人

C．南方古猿

D．直立人