5. 选C。由第五、六两段可知。

　　（四）One possible version

　　There has been a reversal of the brain drain since 1978 across the country. Between 1978 and 2007, about 7,000 overseas Chinese returned to Shanghai after completing their studies abroad. They accounted for about 25% of all returnees nationwide. The year 2008 witnessed a boom. The number of returnees came up to 15,000. By the end of 2010, a further 22,000 will have returned to this city.

　　The reversal of the brain drain mainly arises from three facts. Firstly, our government values overseas Chinese scholars highly, and has worked out a series of preferential policies. In Shanghai, they can enjoy a modern lifestyle. Secondly, China’s economy has been developing at a high speed, which provides them with a vast space of development. Thirdly, the current global financial crisis leaves many overseas Chinese out of work or at the edge of being laid off. They feel more secure at home because the economy is more stable.

　　I hope that more overseas Chinese can head home. There is a bright future ahead of them.

　　(159 words )

　　回归原因：

　　国家重视，政策优惠；上海还提供更国际化的生活方式。

　　我国经济高速发展，回国发展空间大。

　　……（请自拟）

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