下列对动物核移植技术的描述错误的是（  ）

    My uncle is a teacher .He is a  1 man, about 25 years old. He is tall 2  black short hair. He is a very humorous(幽默的) person. He teaches us Chinese. He often  3 us jokes(笑话) and 4to make our class more   5 . In class, he is a very  6  teacher. If we 7  listen to him carefully, he will 8 us some punishment(惩罚) by 9  us some questions.10  after class, he becomes a very good  11 of us. He 12 talks with the girls and plays 13 with the boys.14 of us really like him. He is our 15 teacher.

如图，在矩形ABCD中，∠BAD的平分线交BC于点E，交DC的延长线于点F，取EF的中点G，连接CG，BG，BD，DG，下列结论：

①BE=CD；

②∠DGF=135°；

③∠ABG+∠ADG=180°；

④若$\frac{AB}{AD}$=$\frac{2}{3}$，则3S_△BDG=13S_△DGF．

其中正确的结论是 ____写所有正确结论的序号）

某质点按规律$s=2t^3+1$（s单位：m，t单位：s）作直线运动，则该质点在t=2时的瞬时速度为