A behavior unusual among animals exists among the white winged chough, a species of songbird native to Australia that lives in groups of four to twenty. Such groups sometimes lure away the young of other groups of choughs, feeding and preening these juveniles and then adopting them into their own group. This behavior seems contrary to the instinct birds generally exhibit of maximizing benefits to their own directly related progeny. Which of the following, if true, most contributes to an explanation of the white-winged choughs’ behavior? E) Once juvenile coughs within a group begin to master the skills of finding food, they spend several years before maturity helping the adults in that group to feed subsequent broods. 解析 Explain题型基本上是先寻找题干中的明显矛盾(paradox, contradiction)，然後运用合理 选项加以说明。 本题首先提示某种乌鸦会引诱别的群体的小乌鸦，然後予以收养(adopt)。但是这样的行为 看似与鸟类的本能相违背，因为理论上而言，鸟类应该全力照顾自己的子孙(progeny)才正 确。 合理的解释是E选项。小乌鸦一但学会觅食的技能，在它完全长成(maturity)以前，会帮忙 成鸟(adult)喂养(feed)下一窝(subsequent broods)的幼鸟。这就说明乌鸦把别人家的小鸟 诱拐过来作苦力的功能，同时也说明不违反鸟类的天性，还是以自己的子孙的利益为优先。 本题由江璞老师提供解答 -- ▅▅▅▅ ▅▅ ▅▅▅ ▅ ▅▅ ▅▅▅ █ █ █ █▅ █▄█ ▄ █ █▄█ █ █ █ █▄ █◥▅ █ █▅ █ █ 美加文教101开学季 http://www.merica.com.tw/event/20120901/ --

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