27.The red flag looks extremely beautiful the blue sky and white clouds.
A.through B.a(chǎn)cross C.a(chǎn)gainst 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(chǎn) nice B.the nice C.a(chǎn) nicer D.the nicest
22.- What about Mr.Brown’s speech?
- I understood most of what he said, but not __________ word.
A.a(chǎn)ny B.each C.every D.one
第一節(jié) 單項(xiàng)填空 (共15小題;每小題1分,滿分15分)
從A、B、C、D四個選項(xiàng)中,選出可以填入空白處的最佳選項(xiàng),并在答題卡上將該項(xiàng)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(chǎn); the D.a(chǎn); a
40.(10分)干擾素常用于治療病毒感染引起的疾病,現(xiàn)在可以通過基因工程大量獲得。
請回答相關(guān)問題。
(1)若已知干擾素的氨基酸序列,則獲取目的基因的較簡單方法是 。
(2)基因表達(dá)載體除含有干擾素基因外,還必須有 、 和
等。
(3)如果受體細(xì)胞為受精卵,則此過程還涉及到動物細(xì)胞培養(yǎng)技術(shù),動物細(xì)胞培養(yǎng)的條件包括無菌、無毒的環(huán)境、營養(yǎng)、 、氣體環(huán)境,提供氣體中CO2的主要作用是 。
(4)轉(zhuǎn)基因技術(shù)是否成功,需要對受體細(xì)胞進(jìn)行分子水平的檢測,首先是檢測受體細(xì)胞染色體的DNA上是否插入目的基因,這是目的基因能否在真核生物中穩(wěn)定遺傳的關(guān)鍵,檢測的方法是 。最后,還要檢測目的基因是否翻譯成了相應(yīng)蛋白質(zhì),利用的技術(shù)是 。
(5)2010年春,新疆的特大雪災(zāi)使大量羊凍死。有人就設(shè)想將魚的抗凍蛋白基因?qū)胙虻腳____________________中,培育抗寒能力更強(qiáng)的轉(zhuǎn)基因羊。那么培育該轉(zhuǎn)基因羊的最后一道“工序”是胚胎工程的 技術(shù)。
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