关于基因工程的操作步骤，正确的是 ①将目的基因导入受体细胞

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问题选择题

关于基因工程的操作步骤，正确的是

①将目的基因导入受体细胞 ②目的基因与运载体结合 ③提取目的基因 ④目的基因的检测与鉴定[ ]

A．③①②④

B．②③①④

C．①③④②

D．③②①④

答案

答案：D

选择题

The girl student is very naughty and has formed some bad habits. I think the teacher should ________.[ ]

A. cure them of her

B. cure her of them

C. treat them off her

D. treat her off them

填空题

6叶期的水稻秧苗器官同伸为第第叶叶鞘迅速伸长，第叶节发根和第（）叶发生分蘖。