题目内容
当圆锥的底平面平行水平投影面时，它的底平面的水平投影是完全不可见的。
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U2R4 P1:These attempts to prevent migration are futile, and above all, wrong.这些企图是徒劳的，而且是错误的。U2R4 P2: Secondly, cities need a longer-term and broader vision of the use of urban space to reduce poverty and promote sustainability.其次，城市需要制定更长远、更广阔的计划来开发城市空间，从而减少贫困、促进可持续发展。Poor sanitation does exist. But ____________________ (阻止城市发展是无用的). What we should do is ____________________(促进环境的持续发展).
U2R4 P1:Many policymakers continue to try toprevent urban growthby discouraging rural-urban migration, with measures such as driving the rural migrants out anddenying them services.许多政策制定者依然试图阻止城市化进程，不赞成人们到城市来生活：采取的措施是驱逐流动人口，拒绝给他们提供相应的服务。Many policymakers continue to try to ____________________ (制止城市规模的发展) with measures such as driving the rural migrants out and____________________ (拒绝给予他们各项服务).
U2R4 P3:Thirdly, population institutions and specialists can and should play a key role in supporting community organizations, social movements, governments and the international community in improving the nature and form of future urban expansion, and thus enhancing its power to reduce poverty and promote environmental sustainability.第三，人口研究机构和专家能够而且应该发挥关键作用，支持各种社会组织、社会运动、各级政府和国际社会来改进未来城市扩张的性质和形式，从而增强实力，以减少贫困和促进环境的可持续性。The institution should ____________________ (在支持…上起着关键性的作用) social movements and ____________________(提高能力)to reduce poverty.
我国现有的市场调研报告包括以下几个部分：
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