2011年職稱英語理工類每日一練（3.14）

13．Some scientists are working hard at how title can he harnessed to produce electricity．
    A．changed
    B．converted
    C．used
    D．guided
    14．We do not think such an abnormal phenomenon will last long．
    A．bad
    B．unusual
    C．irregular
    D．terrible
    參考答案：C．B