[单选题]甚高频电波是利用()来传播的A. 天波
B. 空间波
C. 地波
D. 折射波 A.A B.B C.C D.D
参考答案:B
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第1题: [单项选择]Questions 23-25 are based on the following talk:What does the phrase "to run errand" mean in this context A. To go shopping. B. To operate computers. C. To help do something. D. To shop electronically. 参考答案:A 答案解析:此题考查词义,要根据上下文来判断。原文中“By and by,people will do shopping at home”和“Many people will run their errands