A：以免影响胚胎的恢复和进一步发育
B：保证遗传物质的平均分配
C：确保胚胎发育后期营养物质的供应
D：防止分割而来的两个体性状差异大
细胞膜与其完成各种生理功能极为重要的结构特点是( )
You should pay more attention to ____ (pronounce) the words.
With nothing ________ to burn, the fire became weak and finally died out.
