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2.http://www.52en.com/whbm/grammar/index.htm(我爱英语网)
3.http://www.nutshellsoft.com/english/cet4/index.htm(英语精华网)
4.http://lz.qjjj.net/Article/czyy/dxyy/200511/Article_20051130195428.html(清剑精品资料)
5.http://www.meno.com.cn/engexam/CET/Index.html(美诺学习网)
6.http://www.hjenglish.com/doc/enlisten/511_1017.htm(大学英语四级考试听力MP3 100篇)
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