2020-11-17 10:49:44 編輯：無 瀏覽：(768次)
每次錯了題，你畫了一個大大的紅叉叉，心里默念了聲：if you so…
As he collected fossils from strata throughout England, Smith began to see that the fossils told a different story from the rocks. Particularly in the younger strata, the rocks were often so similar that he had trouble distinguishing the strata, but he never had trouble telling the fossils apart. While rock between two consistent strata might in one place be shale and in another sandstone, the fossils in that shale or sandstone were always the same. Some fossils endured through so many millions of years that they appear in many strata, but others occur only in a few strata, and a few species had their births and extinctions within one particular stratum. Fossils are thus identifying markers for particular periods in Earth's history.
According to paragraph 4, it was difficult for Smith to distinguish rock strata because
○the rocks from different strata closely resembled each other
○he was often unable to find fossils in the younger rock strata
○their similarity to each other made it difficult for him to distinguish one rock type from another
○the type of rock between two consistent strata was always the same
由題目中的distinguish rock strate定位原文到「The rocks were often so similar that he had trouble distinguishing the strata, but he never had trouble telling the fossils apart.」
定位句是「The rocks were often so similar that he had trouble distinguishing the strata, but he never had trouble telling the fossils apart.」沒錯，這句話中的so…that…因果關系一定不要讀漏掉。考點確定之后，仔細閱讀因果話題是指rocks were similar ?? he had trouble distinguishing the strata.
仔細分析C選項，their similar指的是誰呢？選項和題干是CP，所以選項指代對象從題干中確定，自然their指代的是Rock strata, 所以C選項指Rock strate’s similarity?而非rocks’ similarity。在這里，正確答案A討論對象就是rock, 并且把similarity改寫成了resemble. 總結下，這道題的考點就是因果?指代。