Scientists are pushing known technologies to their limits in an attempt to______

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问题 Scientists are pushing known technologies to their limits in an attempt to______more energy from the earth.

选项 A、detract
B、protract
C、extract
D、retract

答案 C

解析本题考查动词语义搭配。题干大意为“科学家们正在推进现有技术的发展，以更多的能源”，本题四个选项均以-tract结尾，但其中只有extract(提取，获取)的语义能与energy(能源)构成符合上下文逻辑的搭配，故C选项符合题意。

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