胚由受精卵发育而成，是新生植物的雏体，由胚根、胚芽、胚轴、子叶四部分构成。()

The author argues that______.A．animals have more passions than we usually admitB．non animal research is more effective than animal researchC．to stop using animals is not only imperative but also feasibleD．the pain and suffering imposed on animals should be removed 点击查看答案

果实分两大类。果实成熟以后，果皮肥厚多肉的叫肉果。() 点击查看答案&解析