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由于海洋的天然屏障，与陆地防务相比，在广阔的海上拥有基地，可大大减少战时所用守备兵力，只要掌握了海上运输线，就可以以最机动的方式集中最优势兵力在海外某一区域实施作战。而在陆地取得每个军事胜利都得部署大量守备兵务以巩固成果，海上同等数量的部队，比陆地使用起来会更加高效。 这段文字表明的主旨是( )。
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现代文学学科很大程度被用来阐释现代革命的合理性。某些作家在现代文学史上实际的影响很大，但在建构现代文学这门学科时，人们或者对他们进行批判，或者进行回避，或者进行歪曲，这样就使他们的面貌在教科书和读书界里起起伏伏，沉浮不定。 这段话直接支持的观点是( )。
Text 3In the angry debate over how much of IQ comes from the genes that children inherit from parents and how much comes from experiences, one little fact gets overlooked: no one has identified any genes (other than those in the case of retardation) that affect intelligence. So researchers led by Robert Plomin of London’s Institute of Psychiatry decided to look for some.Plomin’s colleagues drew blood from two groups of 51 children each. They are all White living in six counties around Cleveland. In one group, the average IQ is 136. In the other group, the average IQ is 103. Isolating the blood cells, the researchers then examined each child’s chromosome 6 ( One of 23 human chromosomes along which genes made of DNA). Of the 37 landmarks on chromo- some 6 that the researchers looked for, one jumped out: a form of gene called IGF2R occurred in twice as many children in high-IQ group as in the average group -- 32 percent versus 16 percent. The survey concludes that it is this form of the IGF2R gene, called allele 5, that contributes to intelligence.Plomin cautions that "this is not a genius gene. h is one of many." ( About half the differences in intelligence between one person and another are thought to reflect different genes, and half reflect different life experiences. ) The gene accounts for no more than four extra IQ points. And it is neither necessary nor sufficient for high IQ: 23 percent of the average-IQ kids did have it, but 54 percent of genius kids did not.The smart gene is known by the interesting name "insulinlike growth factor 2 receptor" (IGF2R to its fun). It lets hormones like one similar to insulin dock with cells. Although a gene involved with insulin is not the most obvious candidate for an IQ gene, new evidence suggests it might indeed play the role. Sometimes when a hormone docks with the cell, it makes the cell grow; sometimes it makes the cell commit suicide. Both responses could organize the development of the brain. Scientists at the National Institutes of Health find that insulin can stimulate nerves to grow. And in rat brains, regions involved in learning and memory are chock full of insulin receptors.Even though this supports the idea that IGF2R can affect the brain and hence intelligence, some geneticists see major problem with the IQ-gene study. One is the possibility that Plomin’s group fell for what’s called the chopsticks fallacy. Geneticists might think they’ve found a gene for chopsticks skill, but all they’ve really found is a gene more common in Asian than, say, Africans. Similarly, Plomin’s IQ gene might simply be one that is more common in groups that emphasize academic achievement. "What if the gene they’ve found reflects ethnic differences" asks geneticist Andrew Feinberg of Johns Hopkins University. "I would take these findings with a whole box of salt." Some geneticists don't accept the IGF2R gene-study because（）
You have no fight to ______ yourself from the action of your friends.
2004年1～7月我国城镇固定资产投资比去年同期增长31.1%。1～7月，城镇50万元以上项目累计完成固定资产投资27116亿元，同比增长31.1%，增幅与1～6月份基本持平。其中，国有及国有控股投资15710亿元，增长27.5%；住宅投资5061亿元，增长26%。中央项目投资4274亿元，同比增长5.7%，增幅比1～6月提高4.4个百分点，主要是交通和铁道设备购置增加较多；地方项目投资22842亿元，增长37.2%，回落1.3个百分点。分产业看，第一产业投资277亿元，同比增长15%，比1～6月提高7.8个百分点。第二产业投资10851亿元，增长42.5%，提高0.7个百分点。其中，工业投资10503亿元，增长43%，提高0.7个百分点；建筑业投资349亿元，增长28.7%，提高0.7个百分点。第三产业投资 15987亿元，增长24.6%，回落0.4个百分点。分行业看，纺织及纺织服装业投资495亿元，同比增长29.3%，增幅比1～6月回落3.9个百分点；黑色金属开采和冶炼及压延加工业投资1026亿元，同比增长49.2%，增幅比1～6月回落6.1个百分点；有色金属开采和冶炼及压延加工业投资323亿元，同比增长34.9%，增幅比1～6月回落8.2个百分点。投资增速略有提高的行业有：化学原料和化学制品业投资780亿元，同比增长49.6%，增幅比1～6月提高2.5个百分点；非金属矿物制品业投资591亿元，同比增长55.9%，增幅比1～6月提高2。1个百分点；交通运输设备制造业投资485亿元，同比增长52.4%，增幅比1～6月提高1.5个百分点；电气机械及器材制造业投资219亿元，同比增长55.4%，增幅比1～6月提高7.5个百分点；电力、燃气及水的生产和供应业投资2495亿元，同比增长49.4%，增幅比1～6月提高0.6个百分点。分地区看，东部地区投资15526亿元，同比增长29.5%，增幅比1～6月提高0.8个百分点；中部地区5468亿元，同比增长33.2%，增幅比1～6月回落1.8个百分点；西部地区5561亿元，同比增长35.2%，增幅比1～6月回落1.9个百分点。 分产业看，第一产业投资是第二产业投资的（）。
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