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    American researchers have developed a technique that may become an important tool in fighting AIDS．The technique stops the AIDS virus from attacking its target-cells in the body's defense system．When AIDS virus enters the blood, it searches for blood cells called T4 lymphocytes（淋巴细胞）．The virus connects to the outside of T4 lymphocytes, then forces its way inside．There it directs the cells' genetic（基因的） material to produce copies of the AIDS virus．This is how AIDS spreads.

    Researchers think they may be able to stop AIDS from spreading by preventing virus from connecting to T4 cells．When AIDS virus finds a T4 cell, it actually connects to a part of the cell called CD4 protein.

    Researchers want to fool the virus by putting copies or clones of the CD4 protein into the blood．This way the AIDS virus will connect to the cloned protein instead of the real ones．Scientists use the genetic engineering methods to make the clones．Normally a CD4 protein remains on the T4 cell at all times．The AIDS virus must go to it.

    In a new technique, however, the cloned CD4 protein is not connected to a cell．It floats freely, so many more can be put into the blood to keep the AIDS virus away from real CD4 proteins on T4 cells．One report says the AIDS virus connects to the cloned proteins just as effectively as to real protein．That report was based on tests with blood cells grown in labs．The technique is just now beginning to be tested in animals．If successful, it may be tested in humans within a year.

    1．The new technique can ________.

           A．kill the AIDS virus

           B．produce new anti-AIDS cells

           C．produce new medicines for AIDS

           D．prevent the AIDS virus from spreading

    2．When the AIDS virus enters the blood, it is reproduced by ________.

           A．any blood cells in the body

           B．the inside of the virus itself

           C．the genetic material of T4 cells

           D．the outside of the T4 lymphocytes

    3．The AIDS virus connects to cloned proteins instead of to the real ones because ________.

           A．the cloned proteins stay on the T4 cells

           B．the cloned proteins can float freely in the blood

           C．the cloned proteins are the same as the real proteins

           D．the cloned proteins are made by genetic engineering methods

    4．Which of the following could be the best title of this passage?

           A．The Genetic Causes of AIDS.

           B．A New Approach of Fighting AIDS.

           C．A Report on the Spread of AIDS Virus.

           D．The Technique of Cloned CD4 Protein.

    DCBB

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       Newcomers（新来的人） to the United States are often    36    by the schools. American schools    37    seem so different from the schools they know in    38    parts of the world. American education is based on the    39    that children    40    to learn to think    41    themselves. The school should be the    42    where they learn to do this.    43   , children learn the “three R’s” [(Reading, Writing and Arithmetic(算术)], history and government (often called Social Studies) and many other    44   . They also learn    45   be independent(独立的)，how to make their own judgement(判断), and how to develop their own   46    and interests. The American teacher does not    47   the children in her class to sit    48   hands folded quietly and to say    49  . She wants them to listen attentively(专心地) to ask questions. She knows that    50    children learn from books is    51  . She also knows that it is necessary for them to know how to use this    52   for their   53    and development. During Open School Week, parents have a    54    to see how American education    55   .

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    【小题１】 A. with          B. across               C. over             D. above

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