2. 外语
  3. Trees are a renewable resource that when managed properly can ______our needs indefinitely.

Trees are a renewable resource that when managed properly can ______our needs indefinitely.

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问题 Trees are a renewable resource that when managed properly can ______our needs indefinitely.
选项 A、sustain
B、retain
C、maintain
D、obtain
答案A
解析 近形近义题。由indefinitely可知是在时间上无限地满足我们的需要，sustain“维持，支持”指连续不断地支持、提供某物，符合句意，所以[A]为答案。[B]retain“保持”着重指继续保持，特别强调保持不失去某物或不为他人所夺去；[C]maintain“维持，保持”指保持某种状态，强调坚定性；[D]obtain“获得，得到”。
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大学英语四级

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