—Of course Bill does.
A:the most carefully
B:more carefully
C:the most careful
D:more careful
将△ABC的三个顶点的横坐标乘以-1,纵坐标不变,则所得图形( )
____或者____的大小,叫做它们的面积。
把盛水的试管放在正在加热的沸水中如图,则试管里的水( )