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1、Unit1掌握大量的词汇对于达到一门外语的流利程度是至关重要的。一个非官方的但却是经常被引用的有关剑桥初级证书英语考试（CambridgeFirstCertificateExamination）的数字表明，词汇量少于三千五百词的学生不大有可能在这项考试中成功。最近的研究也表明，其母语为英语的受教育至18岁或18岁以上的人至少认识一万六千个英语词。除非你已经会讲一种像西班牙语或德语这样的语言，要获得大的英语词汇是没有捷径可走的：你就得依靠勤奋和专注。当然，你可以从上下文猜出你阅读中遇到的一些生词的意思，但往往你得
2、查词典才能搞清它们确切意思。一个切实可行的学习新词的方法或许就是大量阅读，最好是读那些你觉得有趣或刺激的故事。反复阅读同一本书常常是很有好处的：你每读一次都会学到不同的生词，而熟悉的背景又有助于将这些新词牢牢地印在你的脑海中。Masteringalargenumberofwordsisessentialtoachievingfluencyinaforeignlanguage.Anunofficial,butoftenquoted,figurefortheCambridgeFirstCertificateexam
3、inationsuggeststhatstudentswithavocabularyoflessthan3,500wordsareunlikelytobesuccessfulintheexam.CurrentresearchalsosuggeststhatnativeEnglishspeakerswhohavebeeneducatedupto18yearsoldorbeyondknowatleast16,000Englishwords.AndunlessyoualreadyspeakalanguagelikeS
4、panishorGerman,therearenoshortcutstoalargevocabularyinEnglish:youjusthavetorelyondiligenceanddedication.Ofcourseyoucanfigureoutfromthecontextthemeaningsofsomenewwordsyoucomeacrossinyourreading,butmoreoftenthannotyouhavetolookthemupinadictionaryinordertobecle
5、arabouttheiraccuratemeanings.Apracticablewaytopickupnewwordsis,perhaps,toreadalot,preferablystoriesthatyoufindinterestingorexciting.Itoftenpaystoreadthesamebookoverandoveragain:eachtimeyoureadityouwilllearndifferentnewwords,andthefamiliarcontexthelpstofixthe
6、minyourmind.20currencydeposit,weprescribeapassonaregularbasis,qilucardaccountonaregularbasis),certificatebondsandsavingsbonds(electronic);3.notdrawnonabanksavingscertificate,certificatebondsapplyformortgageloans,acceptingonlythelender20currencydeposit,wepres
7、cribeapassonaregularbasis,qilucardaccountonaregularbasis),certificatebondsandsavingsbonds(electronic);3.notdrawnonabanksavingscertificate,certificatebondsapplyformortgageloans,acceptingonlythelenderUnit21)Idon’tthinkitisrealistictoturntohimforhelp.Asamattero
8、ffact,hehimselfisinneedofhelp.我认为向他求助是不现实的。事实上，他自己也需要帮助。2)Moreandmorepeoplearebeingawakenedtotheurgentneedofcombatingairpollution.越来越多的人正在意识到与空气污染作斗争的迫切需要。3)Therearevisiblesignsthatsomeofthetime
