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.
If the statements above are true, which of the following must be true on the basis of them
A．Eighteenth-century instruments cannot be used to provide information about the original techniques used in playing such instruments if they have been restored.
B．Eighteenth-century instruments that have been restored can provide information only about how eighteenth-century music originally sounded.
C．Eighteenth-century instruments are the only source of information about the instrument-making techniques of that period.
D．An eighteenth-century instrument that has not been re stored can provide more information than can one that has been restored.
E．(E) An eighteenth-century instrument cannot serve as a source of new information about eighteenth-century instrument-making techniques once it can be played.
参考答案：E
解析： 根据本题的论述可知获得18世纪的音乐听起来怎么样这方面的信息与获得18世纪的乐器制作技术方面的信息具有不兼容性。因此，能指出这两方面不兼容性的选项是正确答案的可能性较大。(E)选项的推理为既然要演奏就必然要先修复，一旦修复就不能成为新的信息来源，由此可知(E)选项的推理指出了这种不兼容性，所以(E)是正确答案；(C)易被误选，许多考生由destroy all of the information认为(C)中的only source成立，但他们忽略了from it，所以(C)选项因“only”一词而不能成立；(A)、(B)和(D)都不能从本题的论述中合理地推出。