2017年专业英语四级听力练习voa常速[权威资料]

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1、2017年专业英语四级听力练习VOA常速本文档格式为WORD,感谢你的阅读。最新最全的学术论文期刊文献年终总结年终报告工作总结个人总结述职报告实习报告单位总结演讲稿2017年专业英语四级听力练习VOA常速　　勤奋学习就是面对学习作业，能一丝不苟的完成;面对学习中的困难，能积极找出困难的原因，勇于克服，不解决困难时不罢休。以下是搜索整理的2017年专业英语四级听力练习VOA常速，希望能给大家带来帮助!更多精彩内容请及时关注我们!　　Anti-EbolaCompoundsShowPromise　　WhiletheWestAfricaEbolaepidemicisbeliev

2、edtobewinding-down,thesearchfornewtreatmentsandvaccinesisnot.OnestudyisaU.S./Serbianefforttofindaneffectiveanti-Eboladrug.　　LastSeptember,thereweresomedirewarningsthatWestAfricaEbolacasescouldeventuallynumberbetween500,000andoneandahalfmillion.Fortunately,thatdidnothappen.ButthebiggestEb

3、olaoutbreakeverdidinfectabout27,000peopleandkilledmorethan11,000.Andaftermorethanayear,it’sstillnotover.WhileLiberiahasbeendeclaredEbola-free,SierraLeoneandGuineahavenot.　　Sohealthandgovernmentofficialssaybetterwaystopreventorcontainanotheroutbreakareverymuchneeded.Anumberofvaccinetrials

4、continueanddifferentdrugsarebeingtested.　　Forexample,theU.S.DefenseThreatReductionAgencyandtheSerbianMinistryofScienceandTechnicalDevelopmenthaveprovidedfundingtostudyasmallclassofmoleculesknownasdiazachrysenes.Initialresearchshowsthatmostofthemice“thatreceivedoneofthreeexperimentalcompo

5、undssurvivedinfectionanddidnotshowanysideeffects.”　　OneoftheresearchersisBogdanSolaja,professoroforganicchemistryattheUniversityofBelgrade.Hesaid,“Thereareseveralchemotypes,severalclassesofcompoundswhichareactuallytodayknowntobeactiveagainstEbola.ButfrombeingactiveagainstEbolatobeingadru

6、gisalong,longway.”　　Everystepinresearchinganewdrug,hesaid,iselementary.　　“Ourcompounds,moreorless,behavegoodinmice.Imeantheycuresomemiceupto90percentasitispresentedinthispublication.”　　ThefindingsappearinthejournalACSInfectiousDiseases.　　Buteventhoughtheresultsareverygood,there’smorethat

7、needstobeknown.Arethesecompoundstoxic?Solajasaidtheyarenot.Cantheycausechangesinapatient’sbody,affectingDNA,forexample?Somethingcalledmutagenesis.Theresearchersaidtheyknowtheanswer,butcannotrevealitatthistime.　　“Thecompoundsarewatersolubleassaltsandtheycanbeadministeredin