智课网GRE备考资料---本文于网络，仅供参考，勿照抄，如有侵权请联系删除---新东方GREargument范文10篇（八）Aspeoplegrowolder,ĠanenzymeknownasPEPincreasinglybreaksdowntheneuropeptidechemicalsinvolvedinlearningandmemory.Butnow,researchershavefoundcompoundsthatpreventPEPfrombreakingneuropeptidesapart.Intests,thesecompoundsalmostcompletelyrestoredlostmemoryinrats.Theuseoftheseco...
