GRE阅读练习每日一篇(四十六)
<p> 编辑点评： <span word="GRE">GRE</span>阅读的方法相信大家已经积累了很多了，本文就为大家提供一些<span word="GRE">GRE</span>阅读的材料，大家来练一练，把平时学到的东西运用到实际中，也多多积累词汇和句子，提高自己的阅读能力。</p><p> 每天做一些标准的<span word="GRE">GRE</span>阅读练习，有助于大家在<span word="GRE">GRE</span>考试的复习过程中不断地进行练习和总结。希望大家在进行<span word="GRE">GRE</span>阅读练习时，充分运用平时所积累的知识，这样才能有效果。</p><p> <span word="Diamonds">Diamonds</span>, <span word="an">an</span> <span word="occasional">occasional</span> <span word="component">component</span> <span word="of">of</span> <span word="rare">rare</span> <span word="igneous">igneous</span> <span word="rocks">rocks</span> <span word="called">called</span> <span word="lamproites">lamproites</span> <span word="and">and</span> <span word="kimberlites">kimberlites</span>, <span word="have">have</span> <span word="never">never</span> <span word="been">been</span> <span word="dated">dated</span> <span word="satisfactorily">satisfactorily</span>. <span word="However">However</span>, <span word="some">some</span> <span word="diamonds">diamonds</span> <span word="contain">contain</span> <span word="minute">minute</span> <span word="inclusions">inclusions</span> <span word="of">of</span> <span word="silicate">silicate</span> <span word="minerals">minerals</span>, <span word="commonly">commonly</span> <span word="olivine">olivine</span>, <span word="pyroxene">pyroxene</span>, <span word="and">and</span> <span word="garnet">garnet</span>. <span word="These">These</span> <span word="minerals">minerals</span> <span word="can">can</span> <span word="be">be</span> <span word="dated">dated</span> <span word="by">by</span> <span word="radioactive">radioactive</span> <span word="decay">decay</span> <span word="techniques">techniques</span> <span word="because">because</span> <span word="of">of</span> <span word="the">the</span> <span word="very">very</span> <span word="small">small</span> <span word="quantities">quantities</span> <span word="of">of</span> <span word="radioactive">radioactive</span> <span word="trace">trace</span> <span word="elements">elements</span> <span word="they">they</span>, <span word="in">in</span> <span word="turn">turn</span>, <span word="contain">contain</span>. <span word="Usually">Usually</span>, <span word="it">it</span> <span word="is">is</span> <span word="possible">possible</span> <span word="to">to</span> <span word="conclude">conclude</span> <span word="that">that</span> <span word="the">the</span> <span word="inclusions">inclusions</span> <span word="are">are</span> <span word="older">older</span> <span word="than">than</span> <span word="their">their</span> <span word="diamond">diamond</span> <span word="hosts">hosts</span>, <span word="but">but</span> <span word="with">with</span> <span word="little">little</span> <span word="indication">indication</span> <span word="of">of</span> <span word="the">the</span> <span word="time">time</span> <span word="interval">interval</span> <span word="involved">involved</span>. <span word="Sometimes">Sometimes</span>, <span word="however">however</span>, <span word="the">the</span> <span word="crystal">crystal</span> <span word="form">form</span> <span word="of">of</span> <span word="the">the</span> <span word="silicate">silicate</span> <span word="inclusions">inclusions</span> <span word="is">is</span> <span word="observed">observed</span> <span word="to">to</span> <span word="resemble">resemble</span> <span word="more">more</span> <span word="closely">closely</span> <span word="the">the</span> <span word="internal">internal</span> <span word="structure">structure</span> <span word="of">of</span> <span word="diamond">diamond</span> <span word="than">than</span> <span word="that">that</span> <span word="of">of</span> <span word="other">other</span> <span word="silicate">silicate</span> <span word="minerals">minerals</span>. <span word="It">It</span> <span word="is">is</span> <span word="not">not</span> <span word="known">known</span> <span word="how">how</span> <span word="rare">rare</span> <span word="this">this</span> <span word="resemblance">resemblance</span> <span word="is">is</span>, <span word="or">or</span> <span word="whether">whether</span> <span word="it">it</span> <span word="is">is</span> <span word="most">most</span> <span word="often">often</span> <span word="seen">seen</span> <span word="in">in</span> <span word="inclusions">inclusions</span> <span word="of">of</span> <span word="silicates">silicates</span> <span word="such">such</span> <span word="as">as</span> <span word="garnet">garnet</span>, <span word="whose">whose</span> <span word="crystallography">crystallography</span> <span word="is">is</span> <span word="generally">generally</span> <span word="somewhat">somewhat</span> <span word="similar">similar</span> <span word="to">to</span> <span word="that">that</span> <span word="of">of</span> <span word="diamond">diamond</span>; <span word="but">but</span> <span word="when">when</span> <span word="present">present</span>, <span word="the">the</span> <span word="resemblance">resemblance</span> <span word="is">is</span> <span word="regarded">regarded</span> <span word="as">as</span> <span word="compelling">compelling</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="the">the</span> <span word="diamonds">diamonds</span> <span word="and">and</span> <span word="inclusions">inclusions</span> <span word="are">are</span> <span word="truly">truly</span> <span word="cogenetic">cogenetic</span>.</p>
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