2. 专升本
  3. Before the invention of refrigeration, the______of fish and meat must have been a problem.

Before the invention of refrigeration, the______of fish and meat must have been a problem.

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问题 Before the invention of refrigeration, the______of fish and meat must have been a problem.
选项 A、treatment
B、maintenance
C、presentation
D、preservation
答案D
解析 treatment：处理，对待；maintenance：维持；presentation：展示，陈述；preservation：保存。根据句意可知，选D。
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