问题补充：
单选题Justassoundtravelsthroughtheairinwaves,electricitytravelsthroughtheairin______radiowaves.A.what is calledB.which is calledC.what it is calledD.which it is called
答案：
A解析 略
1500字范文，内容丰富有趣，写作好帮手！
时间：2022-07-04 11:30:55
单选题Justassoundtravelsthroughtheairinwaves,electricitytravelsthroughtheairin______radiowaves.A.what is calledB.which is calledC.what it is calledD.which it is called
A解析 略
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