黃金閱讀 Begging by Nestlings - 英檢

※ 引述《KirinGuess (Kirin)》之銘言：
: Q14. Directions: An introductory sentence for a brief summary of the
: passage is provided below. Complete the summary by selecting the
: THREE answer that express the most important ideas in the passage.
: Some sentences do not belong in the summary because they express
: ideas that not presented in the passage or are minor ideas in the
: passage. This question is worth 2 points.
: Experiments have shed much light on the begging behaviors of baby
: songbirds
: ●
: ●
: ●
: Answer Choices
: 1 Songbird species that are especially vulnerable to predators have
: evolved ways of reducing the dangers associated with begging calls.
: 2 Songbird parents focus their feeding effort on the nestlings that
: beg loudest for food.
: 3 It is genetically disadvantageous for nestlings to behave as if
: they are really hungry when they are not really hungry.
: 4 The begging calls of songbird nestlings provide a good example of
: overly damaging cost to signalers of signaling.
: 5 The success with which songbird nestlings communicate their hunger
: to their parents is dependent on the frequencies of the nestlings'
: begging calls.
: 6 Songbird nestlings have evolved several different ways to
: communicate the intensity of their hunger to their parents.
: --------------------------------------------------------------------------
: 標注的答案是1、2、3，
: 可是我想請問為什麼4不能選。
: 我覺得第4句點出了這篇文章的一大重點，
: 而且它也不是瑣碎的內容。
: 所以我選了1、3、4。
: 難道是因為第4句太空泛了而顯得不重要？
: 麻煩大家解答了，謝謝。





有關於第4個選項...我有問題
文章第一段第1,2句有提到
Many signals that animals make seem to impose on the signalers costs that are
overly damaging. A classic example is noisy begging by nestling songbirds
when a parent returns to the nest with food.

這跟第4選項不是一樣嘛???

小弟不才,請各位大大解釋^^

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