题目内容
根据《关于做好房屋建筑和市政基础设施工程质量事故报告和调查处理工作的通知》 （建质[20101 111号）的规定，造成5000万元以上1亿元以下直接经济损失的质量事故是 （）。
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根据《钢结构工程施工质量验收规范‘》（GB 50205一2001）， 设计要求全焊透的一、二级焊缝，应采用（）检查进行内部缺陷的检验。
某钢筋混凝土悬臂梁的跨度为2m，’当设计无具体要求时，混凝土强度满足（）时方可拆除底模。
A.despiteB.other thanC.throughD.because of
根据以下内容回答题：
The advantages and disadvantages of a large population have long been a subject of discu-ssion among economists．It has been argued that the supply of good land is limited．To feed a large population，inferior land must be cultivated and the good land worked intensively．Thus，each person produces．1ess and this means a lower average income than could be obtained with a smaller population．Other economists have argued that a large population gives more scope for specialization and the development of facilities such as ports，roads and railways，which are not likely to be built unless there is a big demand to justify them．One of the difficulties in carrying out a world-wide birth control program lies in the fact that official attitudes to population growth val了from country to country depending on the level of industrial development and the availability of food and raw materials．In the developing country where a vastly expanded population is pressing hard upon the limits of food，space and natural resources，it will be the first concern of government to place a limit on the birthrate．Whatever the consequences may be．In the highly industrialized society the problem may be more Com-plex．A decreasing birth rate may lead tp unemployment because it results in a declining market for manufactured goods．When the pressure of population on housing declines，prices also decline and the building industry is weakened．Faced with considerations such as these，the government of a developed country may well prefer to see a slowly increasing population，rather than one which iS stable or in decline．
A smaller population may mean__________ ．
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