在职攻硕英语考试

【单选题】According to the passage, early humans ______.
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

网考网参考答案：C
网考网解析：
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。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>