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

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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 为了从地球获取更多能源,科学家正最大限度地推进现有技术的发展。A项detract “转移;减损”,B项protract“延长;绘制”,C项extract“提取;挖掘” ,D项retract“撤回;缩回”。
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