Military rations also need a longer shelf life, so that they are still edible once they reach their intended recipients. This ca

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问题 Military rations also need a longer shelf life, so that they are still edible once they reach their intended recipients. This can take anywhere from a few months to more than a year, making it imperative that they are long-lasting.

选项 A、unthinkable
B、internal
C、glossy
D、essential

答案D

解析 本题考查形容词辨析。句子前半部分表示,为了保证军粮的可食用性,军用口粮需要更长的保质期。后半部分具体阐述原因,“军粮运送耗时短则几个月,长则一年”由此推断,军粮需要有较长的保持期。essential表示“必要的”,符合题意,故答案为D项。unthinkable意为“不能想象的”。internal意为“内部的”。glossy意为“光滑的”。
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