阅读有三类题型，选词填空、段落匹配和仔细阅读。选词填空是简单的题，只要单词都认识，出错的几率是很小的。段落匹配又叫长篇阅读，篇幅长，做起来比较费劲，但是此题有很多的技巧，仔细阅读把文章读懂，就不会悲剧。今天文都四六级为大家分享2019年6月英语六级阅读理解：夫妻基因差异大，希望对您有所帮助。

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2019年6月英语六级阅读理解：夫妻基因差异大

Opposites Attract in Human Search for Mate

When it comes to choosing a mate, opposites really do attract, according to a 8razilian study that found people are subconsciously more likely to choose a partner whose genetic make-up 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 col1eagues at the University of Parana in Brazil reported.

Although it may be tempting to think humans choose their partners because of their similarities, our research has shown clear1y that it is differences that make for successful reproduction, and that the University drive have healthy children is important when choosing a mate. Bicalho said in a statement.

Scientists said it was not c1ear what signals attract the body to people who are genetical1y 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 random1y 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.

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