The biggest oil spill happened in 1989. Scientists are studying and developing solar power, wind power, and hydroelectric______

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问题 The biggest oil spill happened in 1989.
Scientists are studying and developing solar power, wind power, and hydroelectric______to replace oil.

选项

答案technologies

解析在文章最后一段，作者提到了科学家们正在研究和开发太阳能、风能以及水电来替代石油。

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大学英语四级

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