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sis(肝硬化),liver failure and liver cancer in a small proportion of victims if left untreated.__________(46).
“ It’s a preliminary study, but this is promising. It looks like it has the potential to make a significant impact on hepatitis B,” said Dr Jules L.Dienstag of Massachusetts General Hospital, who directed the study.
Currently the only treatment for hepatitis B is interferon(干扰素). Such a treatment can permanently eliminate the virus in about one-third of patients.___________(47).
In the latest study, doctors found that 3TC appeared to knock out the virus permanently in about 20%of patients when given for three months.___________(48)
Unlike interferon; 3TC is given in pill form and carries few side effects. The drug was approved by the Food and Drug Administration in November for use against AIDS.
Both the hepatitis B virus and the AIDS virus need a protein to reproduce.___________(49). Doctors have tested similar AIDS drugs against hepatitis B. but all except 3TC have turned out to be ineffective or too toxic(有毒的)。
Dr Jay Hoofnagle of the National Institutes of Health said a next step will be to combine 3TC with interferon to see if the two drugs together improve the chance of 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.
第6部分：　完形填空（第51~65题，每题1分，共15分）
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A Special Clock
Every living thing has what scientists call a biological clock that controls behavior. The biological clock________(51) plants when to form flowers and when the flowers should open. It tells insects when to __________(52) the protective cocoon (防护卵袋) and fly away, and it tells animals and human beings when to eat, sleep and wake.
Events outside the plant and animal__________(53) the actions of some biological clocks . Scientists recently found, for example, that a tiny animal changes the color of its fur because of the __________(54) of hours of daylight. In the short_________(55) of winter, its fur becomes white. The fur becomes gray brown in _________(56) in the longer hours of daylight in summer.
Inner signals control other _________(57) clocks. German scientists found that some kind of internal clock seems to order birds to begin their long migration_________(58) twice each year. Birds _________(59) from flying become restless when it is time for the trip, _________(60) they become calm again when the time of the flight has ended.
Scientists say they are beginning to learn which _________(61) of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near the front of the brain__________(62) to control the timing of some of our actions. These __________(63) tell a person when to wake, when to _________(64) and when to seek food. Scientists say there probably are other biological cloc