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本篇是雅思阅读练习题：生物寿命的差异，供大家学习参考。雅思阅读备考阶段，同学们需要通过适量的练习题来检测自己的备考效果。希望以下内容能够对大家的雅思备考有所帮助！
阅读段落
Every organism has a life span which is highly characteristic. There are striking differences in life span between different species, but within one species the parameter is relatively constant. For example, the average duration of human life has hardly changed in thousands of years. Although more and more people attain an advanced age as a result of developments in medical care and better nutrition, the characteristic upper limit for most remains 80 years. A further argument against the simple wear and tear theory is the observation that the time within which organisms age lies between a few days (even a few hours for unicellular organisms) and several thousand years, as with mammoth trees.
段落大意
本段介绍了不同生物之间寿命的差异，以及同类生物寿命长度的相对稳定性。
阅读笔记
Life span differs between different species within one species parameter is Relatively constant
E.g. human life
Argument against the simple theory—— observation
逻辑关系
1. 对比(逻辑连接词: ALTHOUGH)
More and more people attain an advanced age as a result of developments in medical care and better nutrition.
The characteristic upper limit for most remains 80 years.
Amy GUO 经验： 16年 案例：4272 擅长：美国,澳洲,亚洲,欧洲
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