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中国的姓氏有一个非常大的特点，那就是同是一个汉族姓氏，却很可能有着非常大的血缘差异。总体而言，以武夷山——南岭为界，中国姓氏的血缘明显地分成南北两大分支。两地汉族血缘差异颇大，甚至比南北两地汉族与当地少数民族的差异还要大。这说明随着人口的扩张，汉族不断南下，并在2000多年前渡过长江进入湖广，最终越过海峡到达海南岛。在这个过程中间，南迁的汉族人不断同当地说侗台、南亚和苗族语的诸多少数民族融合，从而稀释了北方汉族的血缘特征。 以下哪项如果为真，最能反驳上述沦证
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某出版社近年来出版物的错字率较前几年有明显的增加，引起了读者的不满和有关部门的批评，这主要是由于该出版社大量引进非专业编辑所致。当然，近年来出版物的大量增加也是一个重要原因。 上述议论中的漏洞，也类似的出现在以下哪项中 Ⅰ美国航空公司近两年来的投诉比率比前几年有明显下降。这主要是由于该航空公司在裁员整顿的基础上，有效地提高了服务质量。当然，“9·11”事件后航班乘客数量的锐减也是一个重要原因。 Ⅱ统计数字表明：近年来我国心血管病的死亡率，即由心血管病导致的死亡在整个死亡人数中的比例，较前有明显上升，这主要是由于随着经济的发展，我国民众的饮食结构和生活方式发生了容易诱发心血管病的不良变化。当然，由于心血管病主要是老年病，因此，我国人口的老龄人比例的增大也是一个重要原因。 ⅢS市今年的高考录取率比去年增加了15%，这主要是由于各中学狠抓了教育质量。当然，另一个重要原因是，该市今年参加高考的人数比去年增加了20%。
第三篇 IQ-gene In 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 that cause retardation) that affect intelligence. So researchers led by Robert Plomin of London’s Institute of Psychiatry decided to look for some. They figured that if you want to find a "smart gene", you should look in smart kids. They therefore examined the DNA of students like those who are so bright that they take college entrance exams four years early--and still score at Princeton--caliber levels. The scientists found what they sought. "We have," says Plomin, "the first specific gene ever associated with general intelligence." Plomin’s colleagues drew blood from two groups of 51 children each, all 6 to 15 years old and living in six counties around Cleveland. In one group, the average IQ is 103. All the children are white. Isolating the blood cells, the researchers then examined each child’s chromosome 6 of the 37 landmarks on chromosome 6 that the researchers looked for, one jumped out: a form of gene called IGF2R occurred in twice as many children in the high-IQ group as in the average group--32 percent versus 16 percent. The study, in the May issue of the journal Psychological Science, concludes that it is this form of the IGF2R gene that contributes to intelligence. Some geneticists see major problems with the IQ-gene study. One is the possibility that Plomin’s group fell for "chopsticks fallacy". Geneticists might think they’ve found a gene for chopsticks flexibility, but all they’ve really found is a gene more common in Asians than, say, Africans. Similarly, Plomin’s IQ gene might simply be one that is more common in groups mat emphasize academic achievement. "What is the gene that they’ve found reflects ethnicity" asks geneticist Andrew Feinberg of Johns Hopkins University. "That alone might explain the link to intelligence, since IQ tests are known for being culturally sensitive and affected by a child’s environment. "And Neil Risch of Standford University points out that if you look for 37 genes on a chromosome, as the researchers did, and find that one is more common in smarter kids, that might reflect pure chance rather than a causal link between the gene and intelligence. Warns Feinberg, "I would take these findings with a whole box of salt." Plomin’s IQ-gene study is similar to the chopsticks gene finding in that______.
学校体育教育课程的主要目标是促使所有的孩子身体健康。但只有一小部分孩子曾经参与过集体体育运动。而且，通常集体体育运动对促进参与者健康的效果不如直接集中于有氧锻炼的体育教育课程的效果好。 以上考虑，如果正确，可最有效地被用于反驳：
2010年6月，北京甲公司和天津乙公司签订了一份购销合同。因合同发生纠纷，乙公司遂依照合同中约定的仲裁条款，向北京仲裁委员会申请了仲裁，仲裁委员会接到申请书后，认为符合受理条件，决定受理，由刘某、张某、陈某担任仲裁员仲裁此案，并由陈某担任首席仲裁员。经过审理后，作出裁决。请分析案例，并回答下列81～85题。 北京仲裁委员会作出生效裁决后．一方当事人不履行的，对方当事人可以申请强制执行的机构是：( )。
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