2. 外语
  3. Energy is the currency of the ecological system and life becomes possible even when food is converted into energy, which in turn

Energy is the currency of the ecological system and life becomes possible even when food is converted into energy, which in turn

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问题 Energy is the currency of the ecological system and life becomes possible even when food is converted into energy, which in turn is used to seek more food to grow, to reproduce and to survive.
选项
答案even——only
解析 用only强调条件when food is converted into energy，表示“只有当食物转化为能量时”，而even表示递进没有这个意思。
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