参考答案： E A C F D    

答案解析： 无

1、A New Medicine to Treat Both AIDS andHepatitis BAmedicine approved last moth to treat AIDS(艾滋病)also shows promise against hepatitis B(乙　肝炎).Thedrug, 3TC, puts down the hepatitis B virus in people with chronic infections,stopping its damage to the liver, researchers reported.Aboutone million Americans are thought to be infected with hepatitis B, which canlead to cirrhosis(肝硬化),liver failure and livercancer in a small proportion of victims if left untreated.__________(46).“ It’s a preliminary study, but this ispromising. It looks like it has the potential to make a significant impact onhepatitis B,” said Dr Jules L.Dienstag of Massachusetts General Hospital, whodirected the study.Currentlythe only treatment for hepatitis B is interferon(干扰素).Such a treatment can permanently eliminate the virus in about one-third ofpatients.___________(47).Inthe latest study, doctors found that 3TC appeared to knock out the viruspermanently in about 20%of patients when given for three months.___________(48)Unlikeinterferon; 3TC is given in pill form and carries few side effects. The drugwas approved by the Food and Drug Administration in November for use againstAIDS.Boththe hepatitis B virus and the AIDS virus need a protein toreproduce.___________(49). Doctors have tested similar AIDS drugs againsthepatitis B. but all except 3TC have turned out to be ineffective or too toxic(有毒的)。DrJay Hoofnagle of the National Institutes of Health said a next step will be tocombine 3TC with interferon to see if the two drugs together improve the chanceof curing hepatitis B. “It looks extremely promising,” he said of3TC__________(50)A interferon must be injected for four tosix months and often has unpleasant side effects, including flu-like symptoms,fatigue and depression.B The hospital is among the biggest onesin America.C Dienstag said he hopes that with longertreatment, this response rate can be doubled.D “It’s not the answer, but it’s a step inthe right direction.”E Perhaps20% of these patients havelingering(迁延性的) infections that wouldbenefit f from treatment.F 3TC is one of a group of drugs thatblock production of this protein.