第二节：完形填空(本题共20分，每题1分)
I will never forget that Tuesday afternoon in the doctor's office. I had been feeling sick for a long time and my mum had taken me to hospital to have me 31. Two weeks ago, Dr Richards asked me a great many questions and took 32 of my blood. Now, he was looking at mum and me across his desk and there was a sad look in his eyes. I knew that the news was bad. Dr Richards told me that the test results showed that I was suffering from a 33 disease. "It is cancer," he said. 34 I did not know much about cancer then, I had heard that it was an 35 disease. Hearing it, mum held my hand, crying and I 36 that my life was going to end.
The next year was 37 and difficult for me and my family. Like many people with cancer, I had to be 38 with radiation followed by treatment with chemicals. The treatment made me sick, very sick. There were days when I wished that I were dead so that I would not have to feel so sick. My family and friends were wonderful. They helped me find the 39 I needed to recover and they kept me from feeling sad and 40. The treatment was successful and I was able to go home after exactly fourteen months, two days and six hours in hospital.
Two years have passed and my 41 has not yet ended. 42, I now feel as if that was when my life really began. I plan to live 43 it for a long, long time. Now, the cancer in my body has been 44 for the moment, but I 45 that I will never be completely free from it and my 46 against it will never end.
I now 47 my cancer as a gift. It taught me an important 48 about life. Living with cancer has made me realize how precious life is and how important it is for us to 49 every chance to live life to the fullest. Every day is a new opportunity, and I have learnt to 50 every minute of each day.
31.A. examined B. checked C. tested D. operated
32.A. models B. samples C. types D. sorts
33.A. common B. slight C. serious D. heavy
34 A. Since B. Because C. As D. Although
35. A. easy B. incurable C. ordinary D. unbelievable
36.A. hoped B. found C. thought D. saw
37. A. tiring B. comfortable C. happy D. painful
38. A treated B. cured C. pleased D. satisfied
39. A. resource B. energy C. strength D. power
40. A. single B. alone C. lone D. lonely
41. A. life B. dream C. hope D. belief
42. A. As a whole B. On the contrary C. In general D. In all
43. A. in B. by C. for D. with
44.A. defeated B. cured C. beaten D. recovered
45.A. fear B. know C. realize D. guess
46. A. war B. argument C. struggle D. campaign
47.A. look on B. look up C. look at D. look into
48. A. memory B. lesson C. impression D. thing
49. A. miss B. hold C. take D. lose
50.A. spend B. kill C. waste D. appreciate
53. 20世纪50年代，科学家受达尔文进化思想的启发，广泛开展了人工动、植物育种研究，通过人工创造变异选育优良的新品种。这-过程人们形象地称为“人工进化”。
(1)某农民在水稻田中发现一矮秆植株，将这株水稻连续种植几代，仍保持矮秆，这种变异主要发生在细胞分裂的 期。
(2)我国科学家通过航天搭载种子或块茎进行蔬菜作物的育种，用空间辐射等因素创造变异，这种变异类型可能属于 、 。与诱变育种方法相比，DNA重组技术最大的特点是 。
(3)若以某植物抗病高秆品种与感病矮秆品种杂交，选育抗病矮秆品种，其依据的遗传学原理是
。假设该植物具有3对同源染色体，用杂种一代花药离体培养获得单倍体，其单倍体细胞中的染色体(遗传物质)完全来自父本的概率为 。
(4)“人工进化”和自然界生物进化-样，它们的实质都是 。
52、家兔毛色，褐色和黑色是由一对基因控制的，用基因B和b表示。现有甲、乙、丙、丁四只兔，甲和乙为黑色雌兔，丙为黑色雄兔，丁为褐色雄兔。已知甲和丁交配产的F1全是黑色小兔；乙和丁交配产的F1中有褐色小兔。请回答：
(1)在褐色与黑色这对相对性状中，属于显性性状的是 。
(2)甲的基因型是 ，乙的基因型是 ，丁的基因型是 。
(3)利用甲、乙、丙、丁四只兔，如何鉴别丙兔的基因型
。
51.下图是果蝇体细胞染色体图解，请根据图回答：
(1)此果蝇的性染色体为 ，这是 性果蝇。其性别决定方式属于 型。
(2)该果蝇体细胞中含有 对同源染色体，有 个染色体组，是 倍体。
(3)图中此果蝇体细胞中，有 对常染色体， 对等位基因，1和3是 染色体，A和a是 基因，A和B是 基因。
(4)果蝇在产生的配子中，含ABCD基因的配子占 。
(5)图中A与a基因在遗传中应遵循基因的 规律；A、a与B、b两对等位基因同时遗传时应遵循基因的 规律；D与d基因在遗传中不光遵守基因的 规律，还属于 遗传。
50.下列关于物种形成的叙述不正确的是( )
A. 经过长期的地理隔离而达到生殖隔离是常见的物种形成方式。
B. 隔离是物种形成的必要条件
C. 新物种的形成与种群基因频率改变无关
D. 自然选择对不同种群的基因频率改变所起的作用有差别
主观题部分(40分)：
49.用达尔文的自然选择学说来判断下列叙述，正确的是( )
A、滥用药物导致细菌产生了抗药性变异
B、长颈鹿常努力伸长颈和前肢去吃高处的树叶，因此颈和前肢都变得很长
C、尺蛾工业黑化现象是因为受烟煤污染而被熏黑的
D、野兔的保护色和鹰锐利的目光是它们相互选择的结果
48．双子叶植物大麻(2N=20)为雌雄异株，性别决定为XY型，若将其花药离体培养，再将幼苗用秋水仙素处理，所得植株的染色体组成应是( )
A.18+XY B.18+YY C.9+X或9+Y D.18+XX或18+YY
