2. 外语
  3. It is true that there are still abundant reserves of metals which have not yet been______, but it is necessary to take steps to

It is true that there are still abundant reserves of metals which have not yet been______, but it is necessary to take steps to

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问题 It is true that there are still abundant reserves of metals which have not yet been______, but it is necessary to take steps to ensure that alternative materials are substituted whenever possible.
选项 A、utilized
B、mobilized
C、acquired
D、cultivated
答案A
解析 utilize"利用"；mobilize"动员"；acquire"获得"，acquire knowledge(educa—tion)，不说acquire reserves；cultivate"培植，培育"。
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