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    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）

    阅读下面的短文，文中有15处空白，每处空白给出了4个选项同，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上

    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 clock cells that __________(65) other body activities.

    51 A says B asks C talks D tells

    52 A reach B leave C escape D enter

    53 A affect B adopt C avoid D express

    54 A time B value C amount D number

    55 A days B months C minutes D weeks

    56 A shape B type C form D color

    57 A physical B biological C mental D portable

    58 A operation B flight C movement D transportation

    59 A derived B prevented C originated D protected

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