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阅读段落

Every organism has a life span which is highly characteristic. There arestriking differences in life span between different species, but within onespecies the parameter is relatively constant. For example, the average durationof human life has hardly changed in thousands of years. Although more and morepeople attain an advanced age as a result of developments in medical care andbetter nutrition, the characteristic upper limit for most remains 80 years. Afurther argument against the simple wear and tear theory is the observation thatthe time within which organisms age lies between a few days (even a few hoursfor unicellular organisms) and several thousand years, as with mammothtrees.2015雅思考试时间表

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 speciesparameter 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 inmedical care and better nutrition.

The characteristic upper limit for most remains 80 years.