These companies are absorbed into a larger group to gain eco

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These companies are absorbed into a larger group to gain economies of ___ and keep control over rese
A scope B extent C propotion D scale
正确答案是D
希望能把四个选项都解释下.为什么不选其他三个?
额是proportion。

1.规模经济是经济学上的专业名词,英文为economies of scale
规模经济的定义：由于生产专业化水平的提高等原因,使企业的单位成本下降,从而形成企业的长期平均成本随着产量的增加而递减的经济.
通俗点理解就是当企业发展到一定的规模的时候,其平均的生产成本能随着产量的增加而下降,达到一种规模效应.
2.These companies are absorbed into a larger group to gain economies of scale.
这些公司通过合并成为一家大公司（大集团）,以此来获得规模经济效益.
1）scope一般侧重的是“范围”
within the scope of 在…范围内
business scope 营业范围
scope of application 适用范围
scope of business 经营范围
applicable scope 适用范围
2）extent一般侧重在“程度”
常见的有 to some extent/ to a certain extent 在某种程度上
in some extent 在某种程度上
3)proportion 一般为“比例”的意思,
常见的有in the proportion of 以.的比例
in proportion 成比例
4)scale侧重于“规模,也有“范围”之意思.
常用的有on a large scale 在很大的范围,很大的规模上
而这题是专有名词 economies of scale 规模经济

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