They found that the deception works when the group reaches a certain size—essentially, when enough birds arrive to convince the enemy that it's best to back off. Davis modeled that behavior in software using a military scene and found that it worked even if the group didn't have the firepower to confront the enemy directly.

　　The military is interested in this because a robot that can fool an opponent is a valuable tool. It could lead an enemy down a false trail or make itself look more dangerous than it actually is.

　　文章大意：本文是一篇议论文。文章主要介绍了骗术在军事策略中起着重要的作用，一些研究人员正在通过研究松鼠和鸟类的活动，希望机器人能模仿这些行为，以便能有效地应用于军事中。

　　13．Why does the military want to take advantage of squirrels' trick?

　　A．It can reduce the use of firepower to confront the enemy.

　　B．It can fool the enemy into believing it is more dangerous.

　　C．It can lead the enemy in a wrong direction to avoid losing resources.

　　D．It can scare the enemy away who wants to destroy the acorns.

　　答案：C　推理判断题。根据文章第二段最后一句“... they attempt to fool the thieves by running to a false location.”可知，松鼠为了保护自己的橡果不被其他松鼠吃掉，会朝别的方向奔跑，由此可推知，C项正确。

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