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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