意群训练:The isotopic composition of lead often varies from one source of common copper ore to another,with variations exceeding the measurement error;and preliminary studies indicate virtually uniform is topic composition of the lead from a single copper-ore source.
GRE阅读长难句不是一两天就能攻克的,这需要考生平时的大量积累,才能在GRE阅读考试中获取高分。只要你合理地安排时间,科学的掌握背诵技巧。平时多积累,短时间内,相信你的GRE阅读长难句肯定会有所突破!
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