The biggest problem for most plants, which______just get up and run away when threatened, is that animals like to eat them.
A:shan't
B:can't
C:needn't
D:mustn't
如图,在平面直角坐标系中,A(1,2),B(3,1),C(﹣2,﹣1).在图中作出△ABC关于x轴对称的△A1B1C1.