GRE備考:歷年GRE閱讀材料難句精選100句(六)

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GRE考試形式:中國(guó)大陸地區(qū)、香港、澳門、韓國(guó)目前執(zhí)行分開(kāi)考試的形式。由機(jī)考(分析性寫作)和筆試(語(yǔ)文、數(shù)學(xué))組成。
    51. The best evidence for the layered-mantle thesis is the well-established fact that volcanic rocks found on oceanic islands,islands believed to result from mantle plumes arising from the lower mantle,are composed of material fundamentally different from that of the mid-ocean ridge system, whose source,mostgeologists contend,is the upper mantle. (5 -)
    對(duì)于地幔分層論點(diǎn)來(lái)說(shuō),最好的證據(jù)乃這樣一個(gè)確認(rèn)的事實(shí),即在那些海洋島嶼——這些島嶼據(jù)信是源于由下層地幔升上來(lái)的地幔柱狀溶巖流(mantle plume)——上發(fā)現(xiàn)的火山巖石,是由與海洋中部山脊系統(tǒng)的物質(zhì)根本不同的物質(zhì)構(gòu)成的,而這一海洋中部山脊系統(tǒng)的成因,大多數(shù)地質(zhì)學(xué)家論辯道,為上部地幔。
    難句類型:復(fù)雜修飾、插入語(yǔ)
    解釋:本句前面的主干并不算難,即the evidence is the fact that,難就難在fact之后說(shuō)明fact 的同位語(yǔ)從句。此從句中既有大段插入語(yǔ),又有從句,較為難讀。同位語(yǔ)從句的主語(yǔ)是volcanic rocks,主語(yǔ)后面的found on oceanic islands是分詞修飾volcanic rocks的;islands后面又有一個(gè)說(shuō)明islands的同位語(yǔ)islands believed to result from mantle plumes arising from the lower mantle,此同位語(yǔ)實(shí)際起到一個(gè)分隔主謂的同位語(yǔ)的作用。其后是謂語(yǔ)動(dòng)詞are composed/of fundamentally different from that of the midocean ridge system, whose source, most geologists contend, is the upper mantle。
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