题目

―Director, Jack is ill, so he can’t be here.―Then we’ll have no choice but to give the performance _______ him.A．except for                   B．apart from          C．except              D．without 答案：D与tRNA的反密码子ACG相对应的mRNA中的密码子为(    )。A．UGCB．TGCC．CGTD．CGU