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单选题
A potential factor affecting scientists in their efforts to control the overgrowth of worldpopulation is that______.
A
state administrators do not have confidence in their work.
B
humanists usually cannot cooperate well with them.
C
they haven’t been trained to consider social effects of their work.
D
they do not have enough time to tackle the problem.
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解析：
推断题文章第四段介绍了人口过剩的问题，并指出这个问题既可以看作是诸如政治地理这样的长期问题，又可以看作是科技方面的短期问题。第六段提到，似乎很少有政府规划者会考虑到长期策略和短期策略工作目标之间相互冲突的可能性，但考虑到科学家接受的教育，这种可能性是存在的，特别是他们所受的训练让他们认为只要能找到合适的方法，所有的问题都能迎刃而解。由此可见，作者认为科学家们只注意解决短期的实际问题，从而忽视了长期的社会因素，故答案为C项。A、B、D三项文章中没有提及，故排除。
推断题文章第四段介绍了人口过剩的问题，并指出这个问题既可以看作是诸如政治地理这样的长期问题，又可以看作是科技方面的短期问题。第六段提到，似乎很少有政府规划者会考虑到长期策略和短期策略工作目标之间相互冲突的可能性，但考虑到科学家接受的教育，这种可能性是存在的，特别是他们所受的训练让他们认为只要能找到合适的方法，所有的问题都能迎刃而解。由此可见，作者认为科学家们只注意解决短期的实际问题，从而忽视了长期的社会因素，故答案为C项。A、B、D三项文章中没有提及，故排除。
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