Why do we bring our hands close to the mouth while shouting across to someong far away?A.To let the sound arrive at one point .B.To keep the soung in a small area.C.to keep the sound traveling in one direction.D.to let the sound spread in all directi

来源:学生作业帮助网 编辑:作业帮 时间:2024/09/03 20:37:56
xAN0 EO^ *H=DqdS') ,K[}_ A3Κ)"`X Zd=̰؋Ңb6wHA;݋ s;M@ʠ)*43/T@r3L&)]9zBR^Z} K?Q? OV#;c\