托福閱讀高難度文章長難句實例解析：恐龍滅絕于植物發(fā)展

　　For example, some have blamed dinosaur extinction on the development of flowering plants, which were supposedly more difficult to digest and could have caused constipation or indigestion — except that flowering plants first evolved in the Early Cretaceous, about 60 million years before the dinosaurs died out.

　　結構分析：

　　復合句，帶有which引導的定語從句， except that引導的條件狀語從句，以及before引導的時間狀語從句。

　　句子分析：

　　some have blamed dinosaur extinction on the development of flowering plants，主句中some主語，have blamed 謂語，dinosaur extinction賓語，on the development of flowering plants 賓語。本部分意思：例如一些人將恐龍滅絕歸咎于開花植物的發(fā)展。

　　which were supposedly more difficult to digest and could have caused constipation or indigestion 定語從句修飾plants，which為主語，系表結構 were supposedly more difficult to digest，與動賓結構 could have caused constipation or indigestion作并列謂語。 本部分意思是據(jù)說這些植物更難消化，可能導致便秘或消化不良。

　　except that flowering plants first evolved in the Early Cretaceous, about 60 million years before the dinosaurs died out 條件狀語從句中，flowering plants 主語， evolved 謂語， in the Early Cretaceous 時間狀語 , about 60 million years 定語，修飾the Early Cretaceous。before the dinosaurs died out，時間狀語從句中，the dinosaurs 作主語，died out 謂語。本部分意思是：除非開花植物在早白堊紀，恐龍滅絕前的大約6000萬年前，就已經(jīng)開始進化。

　　參考翻譯：

　　例如一些人將恐龍滅絕歸咎于開花植物的發(fā)展，據(jù)說這些植物更難消化，可能導致便秘或消化不良，除非開花植物在早白堊紀，恐龍滅絕前的大約6000萬年前，就已經(jīng)開始進化。