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注意:在文章中,指代內容通常在代詞之前出現,但有時也會出現在帶代詞后。指代內容可能與代詞在同一個句子,也可能在另一個句子中出現。)3.將所選的答案替代被標識的單詞或短語放回原文,利用語法檢驗它能否使句子表達通順。我們以OGPractice Set 6中的question 2為例:Passage: Tunas, mackerels, and billfishes have made streamlining in to an art form. Their bodies are sleek and pact. The body shapes of tunas, in fact, are nearly ideal from engineering point of view. Most species lack scales over most of the body, making it smooth and slippery. The eyes lie flush with the body and do not produce at all. They are also covered with a slick, transparent lid that reduces drag. The fins are stiff, smooth, and narrow, qualities that also help cut drag.When not in use, thefinsare tucked into special grooves or depressions so thattheylie flush with the body and do not break up its smooth contours…The wordtheyin the passage refers to○qualities○fins○grooves○depressions