9.根据Social Necessity Makes Birds Smart部分第二段Some ravens certainly apply their intelligence for the good of the flock...This bird leads the others to his food store,apparently sharing his finding with the rest of the flock.可知北美的这些乌鸦引导同伴到自己发现食物的地方,让大家一起分享食物。故此题答案可以填写leading/guiding/directing。
10.根据Intelligence Inheritance部分倒数第二句They would never have met the challenge of evolution without some degree of native cunning.可见鸟类是通过基因遗传获得能力和智慧应对进化过程中的挑战。故本题答案为challenge of evolution。
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