google服务打不开的解决办法

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??? 在使用google一些服务的时候，如google文档，google日历等。有时候会出现打不开的现象，可以在C:/WINDOWS/system32/drivers/etc/hosts下添加如下的东西：

209.85.225.101 docs.google.com?
74.125.127.100 writely.google.com?
74.125.127.139 spreadsheets.google.com
209.85.147.109 pop.gmail.com?
209.85.147.109 smtp.gmail.com?
66.102.7.19 mail.google.com?
209.85.225.101 docs.google.com?
209.85.225.102 groups.google.com?
74.125.127.139 spreadsheets.google.com?
74.125.127.100 services.google.com?
74.125.127.100 writely.google.com?
74.125.127.100 sites.google.com?
209.85.225.104 reader.google.com?
74.125.127.101 calendar.google.com