2. 外语
  3. The experiment conducted in Newcastle University shows that ______. According to the passage, early humans ______.

The experiment conducted in Newcastle University shows that ______. According to the passage, early humans ______.

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问题 The experiment conducted in Newcastle University shows that ______.
According to the passage, early humans ______.
选项 A、were less selfish than the present-day people
B、were more co-operative in nature
C、had to be co-operative to survive
D、had to behave better than the present-day people
答案C
解析 本题是细节题，我们可从原文中找到对应：For social groups to work，individuals had to co-operate，rather than act selfishly．其他选项均不符合文意。
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