32.In our class there are 60 students, of ____________ two thirds are boys.
A. which B. them C. whom D. who
31.Mary wrote books to earn money while John gained his wealth _________ selling Mary’s works.
A. on B. by C. in D. through
30.I hated it when people don’t ___________ their promises.
A. carry out B. look out C. run out D. find out
29.________ hard he tried, he could not change his wife’s mind.
A. However B. Whatever C. As D. No matter what
28.------I don’t know why he has made such a silly mistake in the exam.
------ He ____________ it before he handed in the paper.
A. may have checked B. might check
C. must have checked D. should have checked
26.When she finished her story, none of us said anything about it, which made her feel rather ________.
A. embarrassing B. embarrassed C. embarrass D. embarrassment
27 Read the passage a second time, ___________ the meaning won’t become clearer to you.
A. and B. so C. or D. but
25.E-mail, as well as phone calls, _____________ an important part in daily communication.
A. are playing B. is playing C. have played D. has played
第一节:单项填空(共15 小题;每小题1分,满分15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。
21 ------ He runs his own company at the age of 21.
------- ___________________
A. Good luck! B. That’s quite something
C. Congratulations! D. It’s hard to say.
22 ------ How did you find _________ long talk given by the headmaster on ___________ Teachers’ Day?
-------- Boring. I’d rather he had made it short.
A. a ; the B. the ; / C. a ; / D. the ; the
23 ------- How can we __________ to a changeable environment?
-------- By constant study and changing our ideas.
A. adopt B. adapt C. add D. admit
24.If we don’t take steps, some rare animals, such as the Tibetan antelopes and pandas will ____________ some day just as dinosaur.
A. die out B. die away C. die down D. die off
35.(13分)根据细胞中遗传物质的复制和表达的过程,结合所给图示一至五,回答下列问题。
![]()
![]()
(1)图一所示全过程叫
(2)看图回答:
|
|
图二 |
图三 |
图四 |
|
生理过程 |
|
|
|
|
模 板 |
|
|
|
(3)能完成图一中③④的生物是__________________。
(4)图五是_________________,在生物细胞中共有____________种。
(5)基因中 代表遗传信息,基因可通过控制
进而控制生物体的性状,还能通过控制 直接控制生物体的性状。
()
33.
(6分)下图为某家族白化病的遗传系谱图,该病的致病基因位于常染色体上(等位基因用 B 和 b 表示),请分析回答:
(1)9号个体基因型是 ,该病的遗传过程遵循 定律。
(2)在第Ⅲ代个体中,可能不带致病基因的是 ( )
A.10 B. 9 C.8 D. 11
(3)Ⅱ代4号个体基因型是BB的概率是 。
(4)该图能否是红绿色盲病的系谱图?为什么?
。(2分)
34(每空2分,共8分).浙江农科院陈锦江教授发现了油菜产油机制,光合作用产生磷酸烯醇式丙酮酸(PEP)运向种子有两条转变途径,如图所示。并根据这一原理培育出高油油菜,产率由原来的35%提高到58%。
(1)你认为提高油产量的基本思路是
。
(2)图二是控制PEPcasc 酶Ⅱ合成的基因,其中a链是转录链,陈教授及助手诱导该基因的b链也能转录,从而转录出双链mRNA,试问:
①PEPcasc 酶Ⅱ和PEPcasc 酶Ⅰ的本质区别是
。
②转录出的双链mRNA与图二基因的区别是
。
③为什么该基因转录出双链mRNA就能提高油菜产量
。
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