练习册

  • 练习册
  • 试题
    12．If you are a biology student at BU, what is most probably your first choice after you finish reading the webpage? A．Watch the video of the Discussion. B．Buy the magazine Bostonia. C．Watch the video of the Conference. D．Book tickets for the Reunion Weekend. D American researchers say drinking tea may help strengthen the body’s defense system against infection. Doctors at Brigham and Women’s Hospital in Boston, Massachusetts, did the study. The team studied a chemical found in black, green, oolong and pekoe tea. This chemical is an amino acidcalled L-theanine. The scientists say it may increase the strength of gamma delta T cells. That’s the letter T, not the drink. Gamma delta T cells are part of the body’s defenses. First, the researchers mixed some of these cells with antigensfound in the amino acid. Antigens help the body react to infection. Then the scientists added some bacteria. Within twenty-four hours, the cells produced a lot of interferon, a substance that fights infection. Cells not mixed with the antigens did not produce interferon. In the second part of the study, eleven people drank five to six cups of black tea every day. Ten other people drank the same amount of instant coffee. That is dried coffee mixed with hot water. Two weeks later, and again two weeks after that, the researchers tested the blood of all twenty-one people. They also looked at what happened when they added bacteria to the blood cells. They found that the tea drinkers produced five times more interferon after they started drinking tea. The coffee drinkers did not produce interferon. Doctor Jack Bukowski led the study. He says the antigens added to the gamma delta T cells were responsible for the increased reaction to the bacteria. He says the study also showed that the cells were able to remember the bacteria and fight them again the next time. Earlier research already has found that tea can help prevent heart disease and cancer. Doctor Bukowski says the new study must be repeated with more people. If the findings prove to be true, he says, then tea drinking might also help protect against bacterial infections. He says the amino acid L-theanine could be removed from tea and used as a drug to strengthen the body’s defenses. 【查看更多】

     

    题目列表(包括答案和解析)

    阅读理解

    ★This Week’s Highlights

    　　●Visit the new College of Engineering Alumni Web for career services．

    　　●coming events, photo collections, and career services．

    　　●Reunion Weekend 2004 is just around the corner, and we invite you back to BU to take part in all the fun．

    ★BU Breaking News

    　　□Boston University Professor demands Napping at the Workplace in His Speech．(3/18)

    　　□Boston University Hosts Discussion on Putin, U．S．-Russian ties for Future．(3/11)

    　　□BU Physicist Receives Boltzmann Award For Excellent Work In Physics at the Conference．(3/8)

    ★Features

    　　□Learn more about the Young Alumni Council, serving alumni up to 15 years out of BU．

    　　□Offer students jobs for earning income to pay their taxes．

    ★Student Village will be the center of BU life．

    　　□Four BU students share their home schooling experiences, and the lessons they learned．

    　　□Scientists at the South End will study the world’s most dangerous microbes(微生物), and develop measures to bioterrorism．

    　　The Alumni Magazine

    　　Winter 2003

    (1)

    Which of the following statements is true according to the webpage?

    [　　]

    A．

    Alumni Web cares about BU’s scientific research rather than international situations．

    B．

    BU provides students with home schooling．

    C．

    Reunion Weekend 2004 is one of the most important news of this week．

    D．

    Amumni Web was set up 15 years ago．

    (2)

    The underlined word “around the corner” probably means “________”．

    [　　]

    A．

    in the immediate future

    B．

    at present

    C．

    in the distant future

    D．

    around here

    (3)

    If you are a biology student at BU, what is most probably your first choice after you finish reading the webpage?

    [　　]

    A．

    Watch the video of the Discussion．

    B．

    Buy the magazine Bostonia．

    C．

    Watch the video of the Conference．

    D．

    Book tickets for the Reunion Weekend．

    查看答案和解析>>


    同步练习册答案