摘要:57.答案:D.考查名词辨析与搭配.at the mercy of任凭-的摆布.完全受-的支配,atsb’s disposal任某人处理.供某人使用:I had no time at my own disposal. 我没有一点自由支配时间.at the risk of冒-的风险,at the cost of以-为代价.句意为:没有稳定的水源供应.那个地区的农业依然靠天吃饭.
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