In the wild, chimpanzees have been known to hunt together, particularly when

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问题 In the wild, chimpanzees have been known to hunt together, particularly when conditions dictate that a solo hunter will not be successful. Yet this does not prove that our nearest living relatives understand cooperation the same way that we do: such group hunts may simply be the product of independent and simultaneous actions by many individuals with little comprehension of the need for coordinated action to ensure success. A new study, however, shows for the first time that chimpanzees understand when cooperation is needed and how to go about securing it effectively. And another study shows they might even be willing to cooperate without hope of reward.
Alicia Melis of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and her colleagues presented chimpanzees at a sanctuary(保护区)in Uganda with a cooperative challenge. To reach a food tray from behind bars, a chimpanzee had to pull on two ends of a rope threaded through metal loops on the tray. If the chimpanzee simply pulled on one end, the rope would slip the loop. If, however, the chimpanzee unlocked the door to an adjacent room, released a fellow chimp, and cooperated with it to pull on both ends of the rope at the same time, both would be rewarded with the food on the tray.
Although this provides the first glimpse of cooperative understanding outside humanity--and raises the possibility that such abilities might have been present in our common ancestor more than six million years ago--it does not mean that chimpanzees can communicate about a shared goal, like human children. However, in the second study, led by Felix Warneken, also at the Max Planck Institute, three young chimpanzees helped their human minder reach for objects even without any hope of reward--just like human children as young as 18 months old. "This is the first experiment showing altruistic helping toward goals in any nonhuman primate(灵长类动物)," Warneken notes. "It’s been claimed chimpanzees act mainly for their own ends, but in our experiment, there was no reward and they still helped." [br] From what Warneken said in the passage, we can infer that ______.

选项 A、no other nonhuman primate can be as altruistic as chimpanzees
B、altruism has never been observed in any nonhuman animals before
C、chimpanzees did not display altruism in their previous experiments
D、it is the first time they have conducted experiments about chimpanzees

答案 B

解析句义理解。文章倒数第2句Warneken所说的话翻译成：这次试验头一次表明非人类的灵长类动物在获取目标的过程中有利他主义的协助。选项B)内容表达了类似的意思，所以正确。

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