A:原点上
B:x轴上
C:y轴上
D:x轴上或y轴上(除原点)
—Can you come to my birthday party tomorrow?
—__________. I have a lot of homework to do.
如图为某动物细胞的结构模式图,请根据图中细胞各部分结构的特点和功能,分析回答下列问题: