5.下列不是精子、卵细胞发生的区别是

A.初级精母细胞、初级卵母细胞的形成时间

B.M I 和M II 的时间连续性

C.成熟生殖细胞是否经过变形

D.成熟生殖细胞中染色体的数量

4.动物细胞培养与植物细胞培养的重要区别在于

A.培养基不同

B.动物细胞培养不需要在无菌条件下进行

C.动物细胞可以传代培养，而植物细胞不能

D.动物细胞能够大量培养，而植物细胞不能

3.在下列选项中，不需要采用植物组织培养技术的是

A.利用秋水仙素处理萌发的种子或幼苗，获得多倍体植株

B.利用花药离体培养得到单倍体植株

C.利用基因工程培养抗棉铃虫的棉花植株

D.利用细胞工程培养“番茄-马铃薯”杂种植株

2.利用细胞工程方法，以SARS病毒核衣壳蛋白为抗原制备出单克隆抗。下列相关叙述正确的是

A.用纯化的核衣壳蛋白反复注射到小鼠体内，产生的血清抗体为单克隆抗体

B.体外培养单个效应B细胞可以获得大量针对SARS病毒的单克隆抗体

C.将等量效应B细胞和骨髓瘤细胞混合，经PEG诱导融合后的细胞均为杂交瘤细胞

D.利用该单克隆抗体与SARS病毒核衣壳蛋白特异性结合的方法可诊断出病毒感染者

1.下列关于植物组织培养的叙述中，错误的是

A.培养基中添加蔗糖的目的是提供营养和调节渗透压

B.培养基中的生长素和细胞分裂素影响愈伤组织的生长和分化

C.离体器官或组织的细胞都必须通过脱分化才能形成愈伤组织

D.同一株绿色开花植物不同部分的细胞经培养获得的愈伤组织基因相同

Conversation 1

M: I'm done in and must rest here.

W: Why? We just walk 5km, and it is only half of the journey.

M: I have never walked such a long distance for several years.

W: How often do you take exercise?

M: I can’t remember when the last time I worked out is. And I always hurry on with my bus in the morning. I have no time for doing it.

W: Oh, you should take exercise regularly and should have a well-balanced diet. I know you always go to bed after midnight, even more late. This is not a good habit.

M: You look like my old maidservant at this time.

W: No, I talk to you because I know that having a strong constitution is an important condition that you can compete with others in you work.

M: Ok, let’s go on. I don’t want to sit here and listen to your lengthy speech.

W: Hey, come on. I just can’t stand your life style. Working out for an hour every day is good for your health.

Conversation 2

M: Is this your umbrella, Miss? W: Oh, yes, it is. Thank you. I was looking for it just now. M: You look a bit familiar to me. I wonder if I have seen you somewhere before. W: Have you? M: May I ask where you live? W: Just two blocks away, in that tall building. M: That's it. I live there too. I live on the sixth floor. W: My family moved in just two weeks ago. We live on the fourth floor. M: It's a small world. May I know your name? W: I'm Chen Hong. M: How do you do, Miss Chen? I'm Xiao Wei. W: I'm glad to know you, Mr. Xiao. M: Are you going to your office now, Miss Chen? W: No, I'm going to do some shopping for the weekend. What about you? M: I'm going to the airport to meet some friends from Beijing. W: See you later, Mr. Xiao. M: Have a good day, Miss Chen. W: You too.

Conversation 3

M:　 Amazing! Look at this news.

W: Wow, one of the biggest diamonds was found in South Africa.

M: Yes, the weight is 507.55 carat, and it’s a white one.

W:　 The impurity content is very low. Wonderful!

M: Look, with the biggest one, some smaller diamonds were found. There are 168 carat, 58,5 carat, and 53.3 carat.

W: Wow, anyone of them is big enough. But what I want to know is that how they are going to deal with these diamonds.

M: I remember hundreds of years ago, there was another big diamond found in South Africa, but because South Africa was one of the colonies of Britain. The diamond was finally set in the crown of British Queen.

W: Which king is going to have this one?

M: I believe none. The financial crisis and the recovery of the economic are the reasons.

W: Yes, but I still believe it would be made as a very wonderful work.

Conversation 4

M: I just don’t know what’s wrong with my son. He always feels tired and weak. We come here to visit you to find out what the trouble is.

W: From what is written here I can see that your son had a very bad cold two years ago and had a small operation last year. Did he have any effects after that?

M: I can’t really remember.

W: For example, how long did he stay at home each time he was ill?

M: Just a few days, but about three months ago he was home for about a week with a cold.

W: Did he see a doctor at that time?

M: No, he didn’t see a doctor. When he began to feel better, he returned to school.

W: And when did he start feeling so tired?

M: It must have been about a couple of days ago. When he came back from school one day, there just didn’t seem to be any reason to go back the next day.

W: Well, it sounds as if his problem may be his schoolwork. The tests I just made don’t show anything really wrong. I would like to make some further tests.

M: That’s fine with us.

Conversation 5

W: Hi Henry, it's been a long time since we saw each other last. What have you been up to? M: Hi Penny! It's great to see you again. I've been away on business.

W: Really, where did you go? M: Well, first I flew to New York for two meetings. After that, I flew to Atlanta, where I had to make a presentation at a company conference.

W: It sounds like you've been busy. M: Yes, I've been very busy. It's good to be home again. What have you been doing lately?

W: I have been away for the past two weeks visiting my relatives in Chicago. M: I didn't know you have family in Chicago.

W: Yes, that's right. I was born in Chicago and lived there until I went to college. M: How long have you lived here in Colorado?

W: I've lived here for over 10 years. I moved here in 1998 because I had a new job as a sales representative. M: Have you lived in the same house since you arrived?

W: No, first I lived in an apartment in downtown Denver. I moved here four years ago. I've lived on the street for four years and they've been the happiest years of my life. 　M: Yes, my wife Jane and I love this neighborhood.

W: And how long have you lived in your house? M: We've only lived here for two years.

W: That's strange. It seems like you have lived here longer than that. M: No, we moved here in 2006.

W: How time flies! M: I have to agree with you on that. It seems like yesterday that I graduated from college. I can't believe I've been working for more than 10 years!

W: I've been working for more than 30 years! I'm going to retire soon. M: Really? You don't look a day over 40!

W: Thank you. You're a great neighbor! M: Not really. Well, I have to get going. Work is waiting for me. Have a good day.

W: You, too. Glad to have you back in the neighbor!

Conversation 6

report cards, they may be upset when their children’s first semester high school grades are below that level. They may ask why John or Mary isn’t doing better, whether he or she is trying as hard as he or she should, and so on. Sometimes parents regard their children as extensions of themselves and think it only right and natural that they determine what their children do with their lives. In their involvement and identification with their children, they forget that everyone is different and that each person must develop in his or her own way. They forget that their children, who are now young adults, must be the ones responsible for what they do and what they are.

19．(18分)如图所示，图甲是我市某中学在研究性学习活动中，吴丽同学自制的电子秤原理示意图．目的是利用理想电压表的示数指示物体的质量．托盘与电阻可忽略的金属弹簧相连，托盘与弹簧的质量均不计．滑动变阻器的滑动端与弹簧上端连接，当托盘中没有放物体时，刀片恰好指在变阻器R的最上端，此时电压表示数为零。设变阻器总电阻为R，总长度为L，电源电动势为E，内阻为r，限流电阻阻值为R₀，弹簧劲度系数为k，不计一切摩擦和其他阻力．

(1)推出电压表示数U与所称物体质量m的关系式；

(2)为使电压表示数与待测物体质量成正比，请利用原有器材进行改进，在乙图的基础上完成改进后的电路原理图，并求出电压表示数U与所称物体质量m的关系式．

18．(14分)如图所示“神舟五号”飞船发射升空时，火箭内测试仪平台上放一个压力传感器，传感器上面压一质量为M的物体，火箭点火后从地面向上加速升空，当升到某一高度时，加速度为，压力传感器此时显示出物体对平台的压力为点火前压力的，已知地球的半径为R，g为地面附近的重力加速度，试求此时火箭离地面的高度．

17．热敏电阻能够将_________信号转化为电阻变化信号，话筒能将_________信号转化为_________信号．霍尔元件能将_________信号转化为_________信号．

16．常见的将光学信号转化为电信号的传感元件是_________，当光照射时，它的导电性能_________。