A:1个
B:2个
C:3个
D:4个
—Will you please give the dictionary to Jane?
—Sure. I'll give it to her ________ she arrives here.
生殖过程中,人类的受精卵早期依靠卵黄供给营养并不断进行细胞分裂.受精卵逐渐发育成胚泡的部位是( )