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o ? A.The main ingredient of the aging genes.B.A kind of fungus which exists in humans cells.C.The main ingredient of the metabolic enzyme.D.A kind of fungus which has the same type of cells as the those of humans. 参考答案： D 由第3段第4句可知 “yeast” 指的是酵母，即一种真菌，其细胞与人类细胞属同一类。----------------------------------------4After four years work, the researchers find that ? A.The silencing information regulators which repel DNA is the major cause of aging.B.The silencing information regulators prevent DNA from slowing down the development of cells death.C.The silencing information regulators gene is the main element which decides the longevity of life.D.The DNA is incompatible with the silencing information regulators. 参考答案： C 由第3，4段可以看出研究人员认定SIR2基因是决定长寿的关键因素。答案A，B和C都认为DNA和SIR2是不相容的，而文章明确指出SIR2和DNA紧紧地缠绕在一起，相互作用。----------------------------------------5Which of the followings best illustrates meaning of the word “toil” (paragraph 3, line11) ? A.Hard and lengthy workB.Challenging and disagreeable workC.Worthless and repugnant workD.Perilous and lofty work 参考答案： A “toil” 意思是：辛苦而且持续时间长的工作。----------------------------------------1What does “player/coaches” in the sentence “those who fail to transform themselves into ...” means ? A.The managers have to master the skills both as players and coaches, or they will be eliminated from the sports world.B.Thomas H. Davenport suggests the managers to improve their abilities with the standards of players and coaches.C.The managers should transform themselves from overseeing work to participate it, too.D.The players and coaches will be the most popular occupations in the future. 参考答案： C 本文主要讲述了知识经济时代的知识经理人在企业中充当的角色及其未来发展的趋势。 “Increasingly, middle managers heads are on the c
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