We can live without clothes, but food and drink are ________.A.availableB.reliableC.essentialD.traditional
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C解析句意：没有衣服我们可以生存下来，但是食物和饮用水是必不可少的。available--that can be obtained or used可用的；reliable可靠的；essential--pletely necessary for the existence, success etc. of something绝对必要的，必不可少的；traditional传统的。