题目内容：
回答题：ANewMedicinetoTreatBothAIDSandHepatitisB
AmedicineapprovedlastmothtotreatAIDS（艾滋病）alsoshowspromiseagainsthepatitisB（乙 肝炎）.
Thedrug,3TC,putsdownthehepatitisBvirusinpeoplewithchronicinfections,stoppingitsdamagetotheliver,researchersreported.
AboutonemillionAmericansarethoughttobeinfectedwithhepatitisB,whichcanleadtocirrhosis（肝硬化）,liverfailureandlivercancerinasmallproportionofvictimsifleftuntreated.__________（46）.
“It’sapreliminarystudy,butthisispromising.ItlookslikeithasthepotentialtomakeasignificantimpactonhepatitisB,”saidDrJulesL.DienstagofMassachusettsGeneralHospital,whodirectedthestudy.
CurrentlytheonlytreatmentforhepatitisBisinterferon（干扰素）.Suchatreatmentcanpermanentlyeliminatethevirusinaboutone-thirdofpatients.___________（47）.
Inthelateststudy,doctorsfoundthat3TCappearedtoknockouttheviruspermanentlyinabout20%ofpatientswhengivenforthreemonths.___________（48）
Unlikeinterferon;3TCisgiveninpillformandcarriesfewsideeffects.ThedrugwasapprovedbytheFoodandDrugAdministrationinNovemberforuseagainstAIDS.
BoththehepatitisBvirusandtheAIDSvirusneedaproteintoreproduce.___________（49）.DoctorshavetestedsimilarAIDSdrugsagainsthepatitisB.butallexcept3TChaveturnedouttobeineffectiveortootoxic（有毒的）。
DrJayHoofnagleoftheNationalInstitutesofHealthsaidanextstepwillbetocombine3TCwithinterferontoseeifthetwodrugstogetherimprovethechanceof curing hepatitis B “It looks extremely promising,” he said of 3TC__________(50)
A．interferon must be injected for four to six months and often has unpleasant side effects, including flu-like symptoms, fatigue and depression.
B．The hospital is among the biggest ones in America.
C．Dienstag said he hopes that with longer treatment, this response rate can be doubled.
D．“It’s not the answer, but it’s a step in the right direction.”
E．Perhaps20% of these patients have lingering(迁延性的) infections that would benefit f from treatment.
F．3TC is one of a group of drugs that block production of this protein.
（46）__________
参考答案：
答案解析：