【单选题】
A、By surveying on theEarth surface changes.
B、By recording the flog’s movement in the fielD、
C、By messengers on horseback.
D、By the astronomer observing the night sky.
网考网参考答案:C
网考网解析:
[听力原文] How was the news of earthquake brought to the capital city before the invention of such an instrument
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