AI考的是说the nation must maintain a competitive educational system——one that students compete with themselves and against students from other country——to ensure its own economic power.
AA考的是national parks become less attractive during the past 5 years，mine the deposit可以改变现状. mining compaines可以提供更多的就业机会 上月的寂静应该有 之前看到过。
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发表于 2011-5-3 20:23:00
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发表于 2011-5-3 20:34:02
