第3题: [单项选择]Questions 11~14 are based on the following conversation.What is wrong with the cassette recorder A. It was damaged. B. It doesn’t work. C. It destroyed tapes. D. It can’t record things. 参考答案:C 答案解析:[听力原文]11-14 W: Hello, sir. What can I do for you M: Hi. I have this cassette player here that
第16题: [单项选择]声波能绕过某一建筑物传播而光波却不能绕过该建筑物,这是因为( ). A. 声波是纵波,光波是横波 B. 声波振幅大,光波振幅小 C. 声波波长较长,光波波长较短 D. 声波波速较小,光波波速很大 参考答案:C 答案解析:[解析] 建筑物尺度比较大,声波的波长与它相比,相差不大,能发生明显的衍射现象,而光波波长要小的多,不能发生明显的衍射,故C项正确.