①用悬浮培养的胡萝卜单个细胞培养成了可育的植株

②植物用种子进行繁殖

③克隆羊

④用动物干细胞培育出心脏．

男女同学之间的正常交往，应做到（）
① 落落大方，掌握分寸
② 互相帮助，互相学习
③ 心底无私天地宽，不需要考虑交往的方式、场合和时间 
④ 更要提倡男女同学之间的群体交往

读某区域示意图，回答问题。

阅读诗歌回答后面小题。
                                                                                                              跌 倒
                                                                                                              牧 也
                                                                                                       风，跌倒了
                                                                                                      才有了美丽的落叶
                                                                                                      云，跌倒了
                                                                                                      才有了滋润大地的雨水
                                                                                                       所以
                                                                                                       我们不再害怕跌倒
                                                                                                       让我们在跌倒时
                                                                                                       用最美丽的姿势
                                                                                                        站起来