编辑点评： GRE阅读考试的材料，非常强调逻辑的关系，所以逻辑要点是大家在解GRE阅读题的时候的关键，本文就为大家例举了这样一篇逻辑短文，供大家参考和练习。 随着GRE阅读考试的难度日益增加，大家需要有针对性地进行练习，本文为大家例举的就是逻辑短文的练习，文末还附有答案，供大家更好地练习。 Scientists have sought evidence of long-term solar periodicities by examining indirect climatological data, such as fossil records of the thickness of ancient tree rings
These studies, however,failed to link unequivocally terrestrial climate and the solar activity cycle, or even to confirm the cycle s past existence
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It can be inferred from the passage that studies attempting to use tree-ring thickness to locate possible links between solar periodicity and terrestrial climate are based on which of the following assumptions? The solar-activity cycle existed in its present form during the time period in which the tree rings grew
The biological mechanisms causing tree growth are unaffected by short-term weather pat terns
Average tree-ring thickness varies from species to species
Tree-ring thicknesses reflect changes in terrestrial climate
Both terrestrial climate and the solar-activity cycle randomly affect tree-ring thickness
答案：D 上文的题目大家答对了几题?大家不仅要多做题，更要善于总结，这样才会有针对性地提高。
