题目

．—Did he _______ to escape being punished by the police?    —No, he _______ to, but failed.   A．try; managed              B．succeed; tried   C．manage; tried        D．succeed; managed 答案：C下列叙述中正确的是 （ ）A.纯合子自交的后代是纯合子 B.杂合子自交的后代全是杂合子C.两种纯合子杂交其后代仍是纯合子 D.杂合子杂交的后代全是杂合子