问题
填空题
一些我们人看不见的光、听不到的声音在生活中有广泛的应用，如电视机的遥控器是利用______工作的，声呐是利用______工作的．
答案
（1）电视机遥控器是利用红外线进行遥控的．
（2）声呐是利用超声波工作的．
故答案为：红外线；超声波．
搜题请搜索小程序“爱下问搜题”
一些我们人看不见的光、听不到的声音在生活中有广泛的应用，如电视机的遥控器是利用______工作的，声呐是利用______工作的．
（1）电视机遥控器是利用红外线进行遥控的．
（2）声呐是利用超声波工作的．
故答案为：红外线；超声波．
| 阅读理解。 | |||
| |||
| 1. Sunny English Club is for ______. | |||
| A. nurses B. policemen C. businessmen D. students | |||
| 2. You will pay ______ if you want to stay in the English club for half a year. | |||
| A. 300 yuan B. 600 yuan C. 1,200 yuan D. 2,400 yuan | |||
| 3. You can visit Ocean Museum ______. | |||
| A. on Saturday B. on Wednesday C. on Monday D. anytime | |||
| 4. One can get free examinations in Health Centre if he is ______. | |||
| A. 9 B. 17 C. 67 D. 73 | |||
| 5. If you are interested in the life of fish, you should go to ______. | |||
| A. Health Centre B. Ocean Museum C. Sunny English Club D. 16 Yong Le Street |