The contribution of genes make intelligence increase as children grow older. This goes against the notion that most people hold that as we age, environmental influences gradually overpower the genetic legacy we are born with and may have implications for education. "People assume the genetic influence goes down with age because the environmental differences between people pile up in life," says Robert Plomin. "What we found was quite amazing, and goes in the other direction. "
Previous studies have shown variations in intelligence are at least partly due to genetics. To find out whether this genetic contribution varies with age, Plomin’s team pooled data from six separate studies carried out in the US, the UK, Australia and the Netherlands, involving a total of 11,000 pairs of twins. In these studies, the researchers tested twins on reasoning, logic and arithmetics to measure a quantity called general cognitive ability, or "G" . Each st
A. cognitive ability
B. strong heritability
C. genetic legacy
D. challenging pastimes
| The miserable fate of Enron’s employees
will be a landmark in business history, one of those awful events that everyone
agrees must never be allowed to happen again. This urge is understandable and
noble, thousands have lost virtually all their retirement savings with the
demise of Enron stock. But making sure it never happens again may not be
possible, because the sudden impoverishment of those Enron workers represents
something even larger than it seems. It’s the latest turn in the unwinding of
one of the most audacious promise of the 20th century. The promise was assured economic security--even comfort--for essentially everyone in the developed world. With the explosion of wealth, that began in the 19th century it became possible to think about a possibility no one had dared to dream before. The fear at the center of daily living since caveman day A. (A) the corporate lay-offs B. (B) the government cuts in welfare spending C. (C) the economic restructuring D. (D) the warning power of labor unions [简答题]某城市道路工程项目，施工图设计中要求基层采用石灰粉煤灰稳定砂砾，面层采用沥青混合料施工。
在基层施工过程中的一些情况如下： (1)选用的粉煤灰中SiO2、A12O3和Fe2O3的总含量为60%。 (2)通过配合比试验确定相关的指标。 (3)混合料拌成后的平均堆放时间为30h。 (4)拌成后的混合料的含水量略小于最佳含水量。 沥青混合料面层施工严格按行业标准(CJJ1—1990)的规定对其质量进行控制。 某段道路的施工正赶上季节性的雨期。 问题1．指出基层施工过程中的不妥之处，并改正。 2．对石灰粉煤灰砂砾基层质量控制的主要项目有哪些 3．通过配合比试验应确定哪些指标 4．行业标准(CJJ1—1990)对沥青混凝土面层外观检查的要求是怎样规定的 5．道路土路基在雨期施工的质量控制要求有哪些 [单项选择]如在压井过程中必须通过调节节流阀使立压降低0.5MPa，下列种做法正确的是（）
A. 不停地关节流阀直到看见立压开始下降； B. 继续开大节流阀直至立压降低0.5MPa； C. 降低泵速等待立压下降； D. 先降低套压0.5MPa，然后等待立压下降。 [单选题]关于十字头式柴油机的正确说法是()。
Ⅰ.活塞杆只做往复直线运动Ⅱ.气缸采用飞溅润滑Ⅲ.十字头起导向作用Ⅳ.气缸与活塞的间隙很小Ⅴ.气缸与曲轴箱用横隔板隔开Ⅵ.活塞不对缸套产生侧推力 A.Ⅰ+Ⅲ+Ⅳ+Ⅵ B.Ⅰ+Ⅱ+Ⅳ+Ⅴ C.Ⅱ+Ⅳ+Ⅴ+Ⅵ D.Ⅰ+Ⅲ+Ⅴ+Ⅵ [单项选择]2岁小儿身材矮小、匀称，下列哪项诊断不太可能（）
A. 生长迟缓 B. 营养不良 C. 克汀病 D. 慢性腹泻 E. 垂体性侏儒症 我来回答: 提交
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