题目内容
【题目】听一段材料,回答下面几个小题。
【1】What are the speakers talking about?
A. How to get along with John.
B. How to solve John's problem.
C. How to push John into working.
【2】Why is John upset?
A. He has problems with his parents.
B. He has quarreled with the man.
C. He worries about the project.
【答案】
【1】C
【2】A
【解析】听力原文:
W: You don't look happy. What's up?
M: It's the computer assignment. John and I teamed up to do the project together. But so far we've done only half it.
W: Well, you'd better hurry up.
M: I know. But actually, John is not doing anything. I don't know how to say it to him. He's having problems with his parents and has been quite upset these days.
W: But it's supposed to be his work as much as yours. I suggest you talk to him. And let him know that he should share the work.
M: Yes. I think I'll share the work.
答案解析:
(1) 正确答案为C。根据John is not doing anything. I don't know how to say it to him.约翰什么都不做,我不知道要怎么跟他说。可知,二人在谈论如何让约翰参与作业,因此C项正确。
(2) 正确答案为A。根据He's having problems with his parents and has been quite upset these days.他和他父母之间出现了问题,他这些天都很沮丧。可知,约翰沮丧的原因是因为与父母闹了矛盾,因此A项正确。
【题目】某生物兴趣小组对学校草坪的某种雌雄同花的植物进行了遗传学研究,发现该种植物的花色有红色和白色两种。他们查阅资料后发现,该对性状受一对遗传因子控制。为了对该对性状做进一步研究,该小组随机取红花和白花植株各60株均分为三组进行杂交实验,结果如表所示:
组别 | 杂交方案 | 杂交结果 |
A组 | 红花×红花 | 红花︰白花=14︰1 |
B组 | 红花×白花 | 红花︰白花=7︰1 |
C组 | 白花×白花 | 全为白花 |
(1)根据 组结果,可以判断 色为显性.
(2)试解释A组结果没有出现3︰1性状分离比的原因 .
(3)B组亲本的红花中,纯合子与杂合子的比例为 .
(4)要判断B组杂交结果中某红花植株是否为纯合子,最简单的方法是 .