It is a mainly dry country with only a few coastal areas that have rainfall to support a

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A. desperate
B. stubborn
C. violent
(答案→)D. adequate
解析：词义辨析。Desperate令人绝望的；stubborn顽固的；violent   暴力的，猛烈的；adequate充足的，适当的。句意：它只要是一个干旱国家，只有几块沿海地区有充足的降水量来维持庞大的人口。故选D。