【題目】It was a new (idea) to Jason. He thought of his bird with no (seeds) and the cake he wanted to buy for his mother, but was that he would not tell a lie.
A. concerned
B. amazed
C. excited
D. determined
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【題目】The child had a strong ________ for bananas because of their special smell, which made him sick.
A. dislike B. sense C. difficulty D. love
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【題目】—Do I have to bring my camera tomorrow afternoon?
—I think so. We _______ the Botanical Garden then.
A. will be visiting B. are visiting
C. have visited D. visit
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【題目】We got up early for fear that we ______ miss the early bus.
A. could B. should C. will D. can
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【題目】 You won’t find paper cutting difficult __________ you keep practicing it.
A.even if
B.as long as
C.as if
D.ever since
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【題目】隨著人類基因組計劃的進展和多種生物基因組測序工作的完成,人類跨入了后基因組和蛋白質(zhì)組時代。對蛋白質(zhì)進行研究時,首先要獲得純度較高的蛋白質(zhì)。下圖是某生物興趣小組在“蛋白質(zhì)的提取和分離”實驗中,準備從豬的血液中初步提取血紅蛋白,設計的“血紅蛋白提取、分離流程圖”:
請回答下列有關問題:
(1)樣品處理中紅細胞的洗滌要用__________反復沖洗、離心。向紅細胞懸液中加入一定量的低濃度pH7.0的緩沖液并充分攪拌,可以破碎紅細胞,破碎細胞的原理是______________。
(2)血紅蛋白粗分離階段,透析的目的是________________,若要盡快達到理想的透析效果,可以___________(寫出一種方法)。
(3)血紅蛋白的純化是通過____________法將相對分子質(zhì)量大的雜質(zhì)蛋白除去。
(4)電泳利用了待分離樣品中各種分子的_________________等的差異,而產(chǎn)生不同遷移速度,實現(xiàn)各種分子的分離。
(5)一同學通過血紅蛋白醋酸纖維薄膜電泳,觀察到正常人和鐮刀型細胞貧血癥患者的血紅蛋白電泳結果如上圖所示。由圖可知攜帶者有______種血紅蛋白,從分子遺傳學的角度作出的解釋是______________。
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【題目】
What's the______, in your opinion, of helping him if he doesn't make an effort to help himself?
A. sympathy
B. theme
C. object
D. point
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【題目】The entire organization has to be ready to all of these changes at a moment’s notice.
A. refer to B. apply to
C. adapt to D. appeal to
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【題目】 There is still much time left, so I’ll tell you about it __________.
A. in detail B. in brief C. in short D. in all
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