— Kate, your watch is very nice.
— __________
A:That's all right.
B:No, it isn't.
C:Yes, you are right.
D:Thank you.
植物体传粉后,精子和卵细胞在____(花粉管、胚珠)内完成受精;植物受精作用完成后,子房发育成____(果实、种子).