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单选题
The sound-on-film system guaranteed synchronization because the recording was ______.
A
made during the filming of the picture
B
edited by an optical sensor
C
inserted on the film
D
marked on the gramophone
参考答案
参考解析
解析：
题干中关键信息为sound-on-film system，从而定位到第二段。该段指出该系统中，声音作为一系列的符号被记录在电影胶片（celluloid）上，而这些符号可被光传感器（optical sensor）读出，并被“placed on the film alongside the image”，从而确保synchronization，可见这些录音被插入到电影中确保了声音和图像同步，因此选C。
题干中关键信息为sound-on-film system，从而定位到第二段。该段指出该系统中，声音作为一系列的符号被记录在电影胶片（celluloid）上，而这些符号可被光传感器（optical sensor）读出，并被“placed on the film alongside the image”，从而确保synchronization，可见这些录音被插入到电影中确保了声音和图像同步，因此选C。
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