参考答案:基准点、工作基点和变形观测点
在本节中,你将听到15个对话,每个对话有一个问题。请从[A]、[B]、[C]三个选项中选出答案。每段对话后有15秒钟的停顿,以便回答问题和阅读下一问题及其选项。每段对话读两遍。
How often does the woman go home to see her patents()[听力原文] M: How often do you go back to visit your parents F: Um... usually twice a year.
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