— We will have whatever you want.
A:It's up to you.
B:Help yourself.
C:Never mind.
D:You needn't worry.
经过旋转后图形上的对应点到旋转中心的距离____.
下面图形(单位:厘米)的面积是____
人体的口腔、食管、胃、肠、肛门等器官构成的系统是()