He fell off the bike and hurt his leg yesterday._______, he had to stay at home for two or three months.
有人曾风趣地说，中国农民吃饭靠“两平”，一是被誉为中国改革开放总设计师的____，他的责任制拉开了中国农村改革的序幕；二是被誉为“杂交水稻之父”的____。
男性产生精子的器官是 ( )
