Until the start of the Industrial Revolution, mankind was poor, hungry, and constantly at the _______ of disease and natural disasters.
A．powerB．limitC．controlD．mercy
D

試題分析：A. power權(quán)力，B. limit限制，C. control控制，D. mercy憐憫，仁慈，句意：直到工業(yè)革命的開始，人類一直很窮，很餓，受疾病和自然災(zāi)害的支配。At the mercy of…受…支配，選D。
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