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  3. 1.When people in developing countries worry about migration, they are usually concerned at the prospect of their best and bright

1.When people in developing countries worry about migration, they are usually concerned at the prospect of their best and bright

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问题 1.When people in developing countries worry about migration, they are usually concerned at the prospect of their best and brightest departure to Silicon Valley or to hospitals and universities in the developed world. 2. These are the kind of workers that countries like Britain, Canada and Australia try to attract by using immigration rules that privilege college graduates.
   Lots of studies have found that well-educated people from developing countries are particularly likely to emigrate. A big survey of Indian households in 2004 found that nearly 40% of emigrants had more than a high-school education, compared with around 3.3% of all Indians over the age of 25. This "brain drain" has long bothered policymakers in poor countries. 3. They fear that it hurts their economies, depriving them of much-needed skilled workers who could have taught at their universities, worked in their hospitals and come up with clever new products for their factories to make.
选项
答案发展中国家的人考虑移民时，通常关心的是到硅谷或发达国家的医院和大学里工作这样最养好、最光明的前景。
解析 本句是一个主从复合句，逗号前面是when引导的时间状语从句，逗号后面是主句。主句的主干是they are usually concerned at the prospect，介词短语of…departure作后置定语修饰prospect，departure后面跟了两个并列的介词短语对其进行修饰：to Silicon Valley和to hospitals…world。
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