GRE Logical Reading: ETS-GRE逻辑单题ETS - KVVO6RD067O0CNZ9K$

Playing eighteenth-century music on the instruments of that period provides valuable information about how the music originally sounded. Eighteenth-century instruments cannot be played without being restored, however, and restoring such an instrument destroys all of the information that researchers could obtain from it about eighteenth-century instrument-making techniques.