①外植体消毒 ②制备MS培养基 ③接种 ④培养 ⑤栽培 ⑥移栽
A:①→②→③→④→⑤→⑥
B:②→①→③→④→⑤→⑥
C:②→①→③→④→⑥→⑤
D:①→②→③→④→⑥→⑤
You'd better not ask him about the problem. He's new here and he knows ______ about it.