econ101 microeconomics principle and policy (课本上有红色枫叶) 45刀6 n+ `, B9 R. w' _* Z
computing science 101 an introduction to compution with beeperBot and pet (黄色的书) 10刀; D, O4 c: D4 S; C1 s7 Y
ling101 contemporary linguistic analysis(黄色的 sixth edition) 60刀8 ?$ V3 o$ v& R l4 l5 Z$ T
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