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Without a sure supply of water, farming in that area remains at the _______of the weather.
A.disposalB.riskC.costD.mercy
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;at(或in)sb’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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