27.The red flag looks extremely beautiful the blue sky and white clouds.
A.through B.across C.against D.beyond
26.How long do you think __________ the computer company turns out a new product?
A.it will be that B.will it be until
C.will it be since D.it will be before
25.- Good morning.How much should I pay for these books __________ to Alabama?
- Hmm, about ten dollars.
A.to be sent B.being sent C.sent D.having been sent
24.China’s new food law provides for a food recall system __________ producers have to stop production if their food isn’t up to standards.
A.where B.that C.when D.which
23.- Do you think the weather is good enough for the picnic?
-Yes.You couldn’t hope for __________ day at this time of the year.
A.a nice B.the nice C.a nicer D.the nicest
22.- What about Mr.Brown’s speech?
- I understood most of what he said, but not __________ word.
A.any B.each C.every D.one
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,并在答题卡上将该项涂黑。
例:It is generally considered unwise to give a child ___________ he or she wants.
A.however B.whatever C.whichever D.whenever
答案是B。
21.- Really? Who will give __________ lecture next Saturday?
- Mr.Wang, __________ professor from Nanjing University.
A.the; 不填 B.the; a C.a; the D.a; a
40.(10分)干扰素常用于治疗病毒感染引起的疾病,现在可以通过基因工程大量获得。
请回答相关问题。
(1)若已知干扰素的氨基酸序列,则获取目的基因的较简单方法是 。
(2)基因表达载体除含有干扰素基因外,还必须有 、 和
等。
(3)如果受体细胞为受精卵,则此过程还涉及到动物细胞培养技术,动物细胞培养的条件包括无菌、无毒的环境、营养、 、气体环境,提供气体中CO2的主要作用是 。
(4)转基因技术是否成功,需要对受体细胞进行分子水平的检测,首先是检测受体细胞染色体的DNA上是否插入目的基因,这是目的基因能否在真核生物中稳定遗传的关键,检测的方法是 。最后,还要检测目的基因是否翻译成了相应蛋白质,利用的技术是 。
(5)2010年春,新疆的特大雪灾使大量羊冻死。有人就设想将鱼的抗冻蛋白基因导入羊的_____________________中,培育抗寒能力更强的转基因羊。那么培育该转基因羊的最后一道“工序”是胚胎工程的 技术。
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