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    The substance can be added to gasoline to ______ the speed of automobiles.

    　　A. quicken   B. shorten   C. loosen   D. enlarge

    A


    解析:

    Shorten v.缩短, (使)变短；loosen v.解开, 放松, 松开； enlarge v.扩大, 放大； 词缀-en通常加在某些形容词的前面或后面，使其变成相应的动词，该词缀的含义是“使变得更加..”, 如：enlarge就是“使变得更大/扩大”

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