甲、乙、丙三种固体物质的溶解度曲线如图所示,回答下列问题:
右侧漫画《你的我的》启示我们()
A、y=2x﹣1; B、y=2x﹣1; C、y=﹣2x;D、y=﹣2﹣x;E、y=( 12 )x;F、y=( 12 )﹣x
How many ______ are there in his class? ()