The possibilities for ______ energy sources, including solar power, wind power, geothermal power, water power and even nuclear e

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问题 The possibilities for ______ energy sources, including solar power, wind power, geothermal power, water power and even nuclear energy promise greatly to the earthlings.

选项 A、altitude
B、alternate
C、alternating
D、alternative

答案D

解析 alternative用以可以代替其他事物的,其他的;altitude海拔,高度;alternate交替的,轮流的。
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