9.-How is everything, Jason?
- .
A. Not at all B. Very well, thank you
C. I'm all right, thanks D. Not too bad
8. We are quite sure that we can our present difficulties and guarantee
enough supply Of pork in markets.
A. get across B. get over C. get away D. get off
7. The most exciting thing for him was he finally succeeded in
seemed to be the most difficult exam to him.
A. that; what B. that; which C. what; that D. what; which
6. Her smooth spoken English has given her certain advantages others
job hunting.
A. for; of B. over; of C. over; in D. among; in
5. Since Liu Qian, a famous Taiwan magician, performed on CCTV, magic once again
has all over China.
A. taken on B. taken down C. taken off D. taken out
4. and excited, the athletes from all over the world took part in the Special
Olympics held in Shanghai.
A. Honored B. Honoring C. Being honored D. To be honored
3.-Where have you spent this term's scholarship, Lucy?
-On a computer, on the desk over there.
A. that B. this C. one D. the one
2. We had no food left in our backpacks, and things worse, it began to pour.
A. making B. to have made C. having made D. to make
第一节 语法和词汇知识(共20小题;每小题1分,满分20分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
1.-Hi, Maria! I got the first place in the exam.
- ! Everyone knows you cheated and you just copied Tony's.
A. Congratulations B. Come on C. Good luck D. Cheer up
31.(20分)小鼠是遗传学常用的实验材料,性别决定方式为XY型。下面是关于小鼠某些性状的遗传实验:
(1)在一隔离饲养了多代的有毛小鼠种群中,偶然发现一对有毛鼠产下的一窝鼠仔中有几只无毛小鼠。无毛小鼠全身裸露无毛,并终生保持无毛状态。科研人员为了研究小鼠的无毛性状,继续让这对有毛鼠杂交多次,每窝都有无毛雄鼠和无毛雌鼠出生。
①科研人员初步判断:小鼠的无毛性状源于基因突变,不是营养不良或环境条件造成。他们作出这一判断的理由是 。
②若已证明该变异源于基因突变,根据这对有毛鼠的多次杂交后代,还可判定无毛基因不是细胞质基因,其依据是 。
③为了进一步确定这对亲本有毛鼠已携带无毛突变基因,可用无毛基因作探针直接进行检测,该方法利用的原理是 。
(2)小鼠毛色的黄与灰、尾形的弯曲与正常各为一对相对性状,分别由等位基因R、r和T、t控制。在毛色遗传中,具有某种纯合基因型的合子不能完成胚胎发育。从鼠群中选择多只基因型相同的雌鼠作母本,多只基因型相同的雄鼠作父本,杂交所得F1的表现型及比例如下表所示,请分析回答:
|
黄毛尾弯曲 |
黄毛尾正常 |
灰毛尾弯曲 |
灰毛尾正常 |
♂ |
2/12 |
2/12 |
1/12 |
1/12 |
♀ |
4/12 |
0 |
2/12 |
0 |
①控制毛色的基因在 染色体上,不能完成胚胎发育的合子的基因型是 。
②父本的基因型是 ,母本的基因型是 。
③若只考虑小鼠毛色的遗传,让F1代的全部雌雄个体随机交配,在得到的F2代群体中,r基因的基因频率为 。
④让F1代的全部黄毛尾正常雄鼠与黄毛尾弯曲雌鼠杂交,F2代中灰毛鼠弯曲雌鼠占的比例为 。
⑤若F1代出现了一只正常尾雌鼠,欲通过杂交实验探究这只雌鼠是否是基因突变的结果还是由环境因素引起的,写出能达到这一目的的杂交亲本,并作出相应的实验结果预期。
亲本组合: 。
预期实验结果:
i.若是由基因突变导致,则杂交后代的表现为
;
ii.若是由环境因素导致,则杂交后代的表现为
;
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