当前位置:首页 > 托福频道 > 托福学习 > 托福阅读之基因与择偶
发布时间:2012-07-06 关键词:托福阅读之基因与择偶
摘要:托福阅读之基因与择偶
北京新航道给广大的托福考试的学子们提供实用的资讯指导和考试培训,帮助考生来解决相关的各种问题。托福阅读一直是比重比较大的一个类型题,分值和其他题型对等,但是量却比较大,遇到的生词难点也比较多。一篇文章理解不好,可能会一连错题,所以说做好阅读很重要。那么,怎么样才能阅读速度和答题率呢,北京新航道的老师们指出,平时要多练习,再辅助于各种阅读的技巧,相信大家能拿到阅读的。下面使我们整理的一些阅读相关的材料,考生可以看看,增加知识面锻炼阅读能力。
When it comes to choosing a mate, opposites really do attract, according to a Brazilian study that found people are subconsciously more likely to choose a partner whose genetic is different to their own.
They found evidence that married couples are more likely to have genetic differences in a DNA region governing the immune system than were randomly matched pairs.
This was likely to be an evolutionary strategy to ensure healthy reproduction because genetic variability is an advantage for offspring, Maria da Graca Bicalho and her colleagues at the University of Parana in Brazil reported.
"Although it may be tempting to think that humans choose their partners because of their similarities, our research has shown clearly that it is differences that make for successful reproduction, and that the subconscious drive to have healthy children is important when choosing a mate," Bicalho said in a statement.
Scientists said it was not clear what signals attract the body to people who are genetically dissimilar to themselves, but suggested body odor or even face structure could play a role.
Bicalho said the team compared genetic data from 90 married couples with data from 152 randomly generated control couples.
They found the real couples had significantly more dissimilarities in MHC.
"Parents with dissimilar (genetic regions) could provide their offspring with a better chance to ward infections off because their immune system genes are more diverse," they wrote in a summary.
Previous studies have suggested animals may use body odor as a guide to identify possible mates as being genetically similar or dissimilar, she added, but other physical factors may also be involved.
"Other cues such as face symmetry might play a role as well, but they are still in the field of speculation," she said.
上面就是我们新航道为大家整理的一篇托福阅读的材料。读得多懂得多,面对考试也就能够坦然应之了。积少成多是硬道理,望各位考生努力,加油!
了解托福考试和培训的信息