爬取Google的数据，有时被Block，可以让程序随机跳换IP地址，或者增加请求间隔时间，增大每页的查询量等等手段
还有这里列出了 Google Data Centers List for SEO
可以直接访问这些地址，以代替相应的google域名
http://www.vaughns-1-pagers.com/internet/google-data-centers.htm
HERE is a list of about 122 currently active server clusters(?) at 40 Google Data Centers (C-blocks). Since the active servers do not update in any predictable way, it can be helpful for SEO to observe various individual active servers for search engine optimization purposes.
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