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  3. What is the passage mainly concerned with? [br] A sample of a population is ofte

What is the passage mainly concerned with? [br] A sample of a population is ofte

游客2023-08-31  28
问题 What is the passage mainly concerned with? [br] A sample of a population is often examined for the following purposes except ______.
选项 A、to make a more accurate prediction of trend
B、to improve efficiency and avoid unnecessary work
C、to save the trouble of approaching every member
D、to predict characteristics of the entire population
答案 A
解析 细节理解题。找到文章中关于人口抽样的内容，再进行比较选择。但要注意选的是除外的那一项。文章最后一段讲到抽样100个小孩来进行分析预测，A“进行更加准确的趋势预测”，抽样本身就不可能是为了更加“准确”，所以A错，应该选A。B“提高效率，避免不必要工作”，这正是抽样的作用；C“省去找每个成员的麻烦”，这也正是人口抽样的优势；D“预测全体人群的特征”，正是人口抽样的目的，所以选A。
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