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单选题
According to the passage, gramophones were sometimes ineffective because they ______.
A
got out of synchronization with pictures
B
were too large for most movie theaters
C
were newly invented
D
changed speeds when the needle jumped
参考答案
参考解析
解析：
第一段最后一句介绍了把留声机作为音响系统所存在的弊端，指出如果gramophone needle（唱针）jumped，或投影仪的速度发生了变化，那么声音和图像就会变得unsynchronized（不同步的），因此A项符合题意。
第一段最后一句介绍了把留声机作为音响系统所存在的弊端，指出如果gramophone needle（唱针）jumped，或投影仪的速度发生了变化，那么声音和图像就会变得unsynchronized（不同步的），因此A项符合题意。
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