精子获能的主要部位是______和______,卵子受精部位是____________。
参考答案:宫腔‖输卵管‖输卵管壶腹部与峡部连接处
My father _______ to Shanghai. He _______ for over 2 months. [ ]
A. has been, has left
B. has gone, has gone
C. has gone, has been away
D. has been, has gone
下列植物有真正的根、茎和叶一组是( )
A.藻类植物和苔藓植物
B.种子植物和蕨类植物
C.蕨类植物和藻类植物
D.苔藓植物和蕨类植物