B

　　　 The Wal-Mart in Cleburne, Texas, was crowded. People were waiting in long lines at checkout counters to pay for small things that would be next-morning treasures under someone’s Christmas tree.

　　　 The woman standing in cashier Jeffrey Kandt’s line seemed to be living on the edge of subsistence(生计). Her clothes were worn and her hands were those of a person who’d worked hard for what she had. She held a single item in her arms as she patiently waited to move to the front of the line - a Sony CD player. She had saved all year for this. With tax, the total would be close to $ 220.

　　　 As the woman got close to the cashier, she suddenly shouted, “Where’s my money? All of my money fro my son’s gift! Oh no!”

　　　 “Why my line?” Kandt thought as he watched the poor woman searching through her clothes. He was going to have to call his manager to avoid the sale but it would mean a long wait for the customers behind her. “I am going to go home late tonight,” Kandt thought.

　　　 Then an amazing thing happened. At the back of the line, a man took out his wallet, pulled out $100 and passed it forward. As the cash moved up the line, a twen5ty-dollar bill was added here, and a ten-dollar bill was added there. When the collection finally reached the registewr, Kandt counted $ 220.

　　　 Strangers had fulfilled a poor woman’s Christmas wish.

　　　 The poor in his line at the Wal-Mart in Cleburne, Texas, had come together on Christmas Eve, 2002.

60．According to the passage, the woman’s Christmas wish was to ______.

　　　 A．collect $ 220 for her family　　 B．buy her son a CD player as a gift

　　　 C．buy enough food for her family　　　 D．organize a big party for her son

61．Which of the following statements is TRUE about Jeffrey Kandt when the woman couldn’t find her money?

　　　 A．He was impatient and wanted to go home.

　　　 B．He wanted to see whether the woman had money or not.

　　　 C．He wanted the woman to stand in another line.

　　　 D．He didn’t think about the customers waiting behind the woman.

62．What does paragraph 5 mainly talk about?

　　　 A．a description of a man standing in the line　　　　　　

　　　 B．the cashier, Jeffery Kandt

　　　 C．the collection of $ 220

　　　 D．a reason why the strangers collected he money

63．What can we learn from the passage?

　　　 A．The woman collected money by herself.

　　　 B．The woman seemed to be poor, but in fact had lots of money.

　　　 C．Strangers in the line volunteered to help the woman.

　　　 D．The woman had never ay money.

A

The cost of medical care in the United States is very high. More time and money that doctors spend on their medical education is probably one reason for this problem.

A visit to a doctor’s office costs from 15 to 50 dollars. It is almost impossible for people to pay for the medical care they need .Many people in the United States think that doctors are overpaid. Most doctors, however, disagree. They say that they were required to study medicine for a log time Tuition for many years of medical education costs a lot of money. Doctor say that it is necessary for most medical students to borrow money from bank to pay their tuition. Because they must be repaid to the bank, young doctors need to receive a lot of money for their work. So, they charge people high prices for the medical care.

Therefore, it is impossible that the high cost of medical care in America is unnecessary, because high tuition is one cause of high costs. One way to lower cost would be to have medical school that are free or have low tuition.

56 The word “tuition” in the passage probably refers to_______.

A. teaching the students　 B. studying the courses　

C payment for education　 D living at school

57.The reason for the high medical cost told in the passage is that_____.

　 A. tuition in the medical school is high　 B the price of medical is high

　 C doctors are overpaid　　　　　　　　 D doctors must pay money to the banks

58. One way to lower the cost of medical care would be ______.

　 A. not to see a doctor

B. to pay doctors less money

　 C to let medical students have free or partly free medical education

D to forbid doctors to ask their patients for too much money

59The main idea of the article is that____.

　 A. a visit to a doctor’s office may cost as much as﹩15to﹩50 in the United States

B the cost of medical care is the main reason for the high cost in the United State

C medical care in the United States costs a lot of money because doctors want to be rich

D the high cost of tuition in medical school is one reason for the high cost of medical care in America

52.(10分)细胞分裂间期是DNA复制和蛋白质合成等物质积累的过程。

⑴在DNA的复制过程中，DNA在　　 的作用下，　　 键断裂，使双螺旋解开成为两条单链，并以每一条单链为模板，采用　　　 复制方式合成子代DNA分子。新合成的DNA与模板DNA完全相同的原因是： ①__________________________________，②_______________________________________。

⑵某基因中的一段序列为……TAT GAG CTC GAG TAT……，据下表提供的遗传密码推测其编码的氨基酸序列：　　　　　　　　　　　　 。该编码过程

发生的场所为___________。它与DNA的复制过程的不同之处有：__________ ______________________________________________________-------------------------------------(任意说出三点)。

53 (12分)农业上常用的育种方法如下：

a．甲品种 × 乙品种→F₁→F₁自交→F₂人工选择→自交→F₃→人工选择→自交……→性状稳定的新品种

b．甲品种 × 乙品种→F_l→F₁花粉离体培养得到许多小苗→秋水仙素处理→若干植株→F₁人工选择→性状稳定的新品种

c．正常幼苗→秋水仙素处理→人工选择→性状稳定的新品种

d．种子搭载人造卫星到太空→返回地面种植→性状稳定的新品种

e．获取甲种生物的某基因→通过某种载体将该基因带入乙种生物→性状稳定的新品种

　 (1)a方法属于常规育种，一般从F₂代开始选种，这是因为　　　　　 。选中的个体还需要

　　　 经过若干代的自交、鉴别，直到不发生分离为止，这是因为新品种一定要是　　　　 　。

　 (2)b方法与第(1)种方法相比，突出的优点是　　　　 　　。若F₁有n对杂合的基因(分别

　　　　 位于n对染色体上)，则利用其花粉离体培养育成的小苗理论上应有 　　　　　种类型。　　

　 (3)通过c途径获得的新品种应属于　　　　　 体，育种中使用的秋水仙素的主要作用是　　　　　　

作用的时期是------------------

(4)d方法中搭载的种子应当是　　　　　　　　　　 (干燥的、萌动的、休眠的)；种子

　　 返回地面种植后，其变异　 　　　　　　　(全是对人类有益的、不全是对人类有益的、　

　　 全是对人类有害的)，所以要对其进行　　　　　　 。

(5) e方法培育出的新类型生物可以表达出甲种生物的某基因的遗传信息，该表达过程应

　　 包括遗传信息的　　　　 　　　　　和　　　　　　　 　　过程。

54(16分)果蝇的红眼(A)对白眼(a)为显性，长翅(B)对残翅(b)为显性，这两对基因是自由组合的。(A-a在X染色体上，B---b在常染色体上)

(1)红眼雌果蝇与白眼雄果蝇交配，F₁代全是红眼。根据所学的知识回答：

①亲本的基因型-----------

②若F₁代自交，则所得的F₂代的基因型有------ 种，F₂代的表现性有-------- 种，　

③F₂代的卵细胞及精子中具有A和a的比例分别是---------　

(2)红眼长翅的雌果蝇与红眼长翅的雄果蝇交配，后代的表现型及比例如下表：

　　 ①亲本的基因型--------------

②雄性亲本产生的精子基因型是-------，

③若对雌性亲本测交，所得后代雌雄的比例为----------，后代中与母本表现型相同的个体占后代总数的--------

55(2008江苏高考 12分)下图为甲种遗传病(基因为A、a)和乙种遗传病(基因为B、b)的家系图。其中一种遗传病基因位于常染色体上，另一种位于X染色体上。请回答以下问题(概率用分数表示)。

(1)甲种遗传病的遗传方式为___________。

(2)乙种遗传病的遗传方式为___________。

(3)Ⅲ-2的基因型及其概率为　　　　　　　　　　　　　 。

(4)由于Ⅲ-3个体表现两种遗传病，其兄弟Ⅲ-2在结婚前找专家进行遗传咨询。专家的答复是：正常女性人群中甲、乙两种遗传病基因携带者的概率分别为1/10 000和1/100；H如果是男孩则表现甲、乙两种遗传病的概率分别是____________，如果是女孩则表现甲、乙两种遗传病的概率分别是___________；因此建议____________。

1-5　 CADDB　 6-10ADACB　 11-15CCDBA　 16-20DCCAC　 21-25BCBBA

26-30DCBCB　 31-35BBADC　 36-40DCCCB　 41-45BBBAA　 46-50DDBBC

51(1)AC　 BDE (2)8　 8　 4 (3)ABCE　 (4)AD　 (5)AD

(6)体细胞　 4

52　 ⑴解旋酶　 氢　 半保留　 DNA独特的双螺旋结构　 复制过程中遵循碱基互补配对原则　 ⑵……异亮氨酸-亮氨酸-谷氨酸-亮氨酸-异亮氨酸……　 核糖体　 模板不同；原料不同；场所不同；碱基互补配对方式不同；所使用的酶不同(任意说出三点)

51.(10分)下图的五个细胞是某一生物个体的不同细胞的分裂示意图。请回答以下问题：

(1)A、B、C、D、E中属于有丝分裂的是___________，属于减数分裂的是___________。

(2)A细胞有______条染色体，有______个DNA分子，含有_____________个染色体组。

(3)具有同源染色体的细胞有___________。

(4)染色体与前一时期比，暂时加倍的细胞有___________。

(5)不具有姐妹染色单体的细胞有___________。

(6)A细胞经分裂形成的子细胞是___________，染色体有___________条。

50.甜豌豆的紫花对白花是一对相对性状，由非同源染色体上的两对基因共同控制，只有当同时存

在两个显性基因(A和B)时，花中的紫色素才能合成，下列说法中正确的是

A．白花甜豌豆杂交，后代不可能出现紫花甜豌豆 B．紫花甜豌豆自交，后代中紫花和白花的比例一定不是3：1 C．AaBb的紫花甜豌豆自交，后代中紫花和白花甜豌豆之比为9：7 D．若杂交后代性状分离比为3：5，则亲本基因型只能是AaBb和aaBb

49、(2009全国卷1)已知小麦抗病对感病为显性，无芒对有芒为显性，两对性状独立遗传。用纯合的抗病无芒与感病有芒杂交，F₁自交，播种所有的F₂,假定所有的F₂植珠都能成活，在F₂植株开花前，拔掉所有的有芒植株，并对剩余植株套袋。假定剩余的每株F₂收获的种子数量相等，且F₃的表现型符合遗传定律。从理论上讲F₃中表现感病植株的比例为

A.1/8　　　　 B.3/8　　　　 C.1/16　　　　 D.3/16