【题目】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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【题目】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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【题目】—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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【题目】We got up early for fear that we ______ miss the early bus.
A. could B. should C. will D. can
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【题目】 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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【题目】随着人类基因组计划的进展和多种生物基因组测序工作的完成,人类跨入了后基因组和蛋白质组时代。对蛋白质进行研究时,首先要获得纯度较高的蛋白质。下图是某生物兴趣小组在“蛋白质的提取和分离”实验中,准备从猪的血液中初步提取血红蛋白,设计的“血红蛋白提取、分离流程图”:
请回答下列有关问题:
(1)样品处理中红细胞的洗涤要用__________反复冲洗、离心。向红细胞悬液中加入一定量的低浓度pH7.0的缓冲液并充分搅拌,可以破碎红细胞,破碎细胞的原理是______________。
(2)血红蛋白粗分离阶段,透析的目的是________________,若要尽快达到理想的透析效果,可以___________(写出一种方法)。
(3)血红蛋白的纯化是通过____________法将相对分子质量大的杂质蛋白除去。
(4)电泳利用了待分离样品中各种分子的_________________等的差异,而产生不同迁移速度,实现各种分子的分离。
(5)一同学通过血红蛋白醋酸纤维薄膜电泳,观察到正常人和镰刀型细胞贫血症患者的血红蛋白电泳结果如上图所示。由图可知携带者有______种血红蛋白,从分子遗传学的角度作出的解释是______________。
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【题目】
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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【题目】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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【题目】 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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