题目

我国婚姻法规定禁止近亲结婚的理论根据是（ ） A.近亲结婚必然使后代患遗传病 B.近亲结婚使后代患有遗传病的机会增加 C.近亲结婚违反社会的伦理道德 D.人类遗传病都是由隐性基因控制的   答案：B我国婚姻法规定禁止近亲结婚，其理论依据是，在近亲结婚的情况下，双方从共同祖先那里继承同一种致病基因的机会就大大增加，双方很可能都是同一致病基因的携带者。这样，他们所生的子女患遗传病的机会比随机婚配的非近亲结婚者多许多。口语运用阅读下面对话。从方框内7个选项中选择5个恰当的句子完成此对话。A. And both of us are outgoing.B. She is good at drawing.C. She likes basketball.D. Who is more outgoing?E. What about you?F. They’re both funny.G. Harry is quieter than me.Mike: Who is your best friend, Connie?Connie: Helen.Mike: Why ?Connie: Because she likes to do the same things as I do. 1. .Mike: Are you good at drawing , too ?Connie: Sure. We both like drawing. 2.Mike: 3.Connie: She is more outgoing than me. I am a little quieter . 4. Who is your best friend ?Mike: My best friend is Harry.Connie: Is he like you ?Mike: No, he isn’t. 5. And I’m more outgoing. But some people say that we look the same.