therw are some means of...(17)... one of themis a radio . it is used at home , in cars , on ships, even as radar on an airplane. to get better and clearer sound

therw are some means of...(17)... one of themis a radio . it is used at home , in cars , on ships, even as radar on an airplane. to get better and clearer sound , a home radio usually has antennas. nowadays, radio broadcatings offer an ....(18)... communication between the broadcasters and the listeners. 17. a. transportation b. appliances c. communication. d. equipment. 18. a. interview. b. interactive c. inclusive d. appreciative