Nobody yet knows how long and how seriously the ________ in the financial system will drag down the economy.
句意：无人知晓金融体系的动荡会在多长时间内和多大程度上把经济拖垮。shakiness动荡；颤抖；摇晃。shallowness肤浅。scantiness缺乏；不足。stiffness僵硬；坚硬。故选B。