Even so, the blubber insulation is so effective that marine mammals maintain body core temperatures of about 36-38'C with metabolic rates about the same as "those" of land mammals of similar size. those往前推，看到銜接句意的詞"with" 往with右邊找，看到metabolic rates 簡單帶入句子中檢查發現無誤，選D進入下一題 這是我做這類題目的方式 至於為何不選core temperatures，因為選了core temperatures 就顯得metabolic rates在句中的地位很奇怪 而且with的出現是連接另一句意，those如果代替的是上一句意中的詞 會讓句子變得怪怪的 至於topractise推文中提的這個問題 http://www.usingenglish.com/forum/ask-teacher/76700-where-relative-adverb.html But decades later, a city of sorts—actually a series of settlements connected by roads—has been found at the headwaters of the Xingu River where Fawcett went missing in an area previously buried beneath the dense foliage in what is now Xingu National Park. 我習慣把插入句精簡掉不看 But decades later, a city of sorts has been found at the headwaters of the Xingu River where Fawcett went missing in an area previously buried beneath the dense foliage in what is now Xingu National Park. where指的可能是藍色部分的地點 但，如發文者說的 where可能是the Xingu River? the headwaters of the Xingu River? the headwaters? where到底指的是什麼，基本上要看後面句意的描述 從這段截文很難看出來，最穩的方法是選the headwaters of the Xingu River 因為the headwaters of 本來就是出現來修飾the Xingu River的 把它看作一個整體是最穩也最不會弄錯的選法 --

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