Water can____________rocks after a long time, even though the rock is harder.
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Red meat, eaten__________, is very high in fat and calories.
Into her nineties, her thinking remained______and her character forceful.
We have_________ $25 per adult to arrive at a basic room rate
显微镜的分辨率主要取决于：
A. 焦距
B. 数值孔径
C. 放大率
D. 视场角
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