托福阅读：基因差异与择偶

　　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.

 

托福阅读：基因差异与择偶的延伸阅读——托福阅读一次通过秘诀

 

　　1 ，快速阅读：

　　平时进行大量的快速阅读。

　　可选的阅读材料有：时间，“新闻周刊”，经济学家，中国日报，21世纪等。

　　因为托福考试与时代紧密相连，具有一定的时效性，所以报刊文章为泛读的首选。阅读报刊文章应选择一般性的题材，如科普，社会问题，学术观点性的文章，而政治，军事，尖端科技的文章可以略过。采取的阅读方式为快速阅读。

　　2 ，难句突破：

　　在精读和做托福试题时，将复杂的难句摘抄出来，然后分析句子结构，彻底消化难点。虽然托福阅读中不可能有原句重现，但是难句的结构是基本不变的。

　　3 ，词汇强记：

　　词汇量不够，应进行词汇突击。托福考试的词汇量约为6000~8000词。词汇量小也是导致阅读理解速度慢的重要因素。

　　4 总结技巧：

注意分析阅读理解的套路，总结解题技巧。如果个人复习情况不佳，可以根据自己的实际情况选择合适的辅导班。