题目

下列四条DNA分子，彼此间间具有粘性末端的一组是   ①                                                                                                                                            ②         ③                                        ④ A.①②      B.②③        C.③④         D.②④—You joined in the singing at last night’s party? But I know you don’t do well in it.—________. I did it just to show that I am brave enough to do something I’m not good at.A.Not reallyB.That’s not the pointC.I can’t agree moreD.It sounds like a pity