The arbitrary nature of language is absolute, i.e., there are no words in world languages that maintain a correspondence between form and sound.（）

单句改错Believe it or not! The new train can travel at a sp...

未知题型单句改错Believe it or not! The new train can travel at a speed of sound.单句改错 Believe it or not! The new train can travel at a speed of sound.

I hope you can come back safe and sound. _____________

未知题型I hope you can come back safe and sound. _____________

科学家宣布完成人类基因组“完成图”的文件是《 》

未知题型科学家宣布完成人类基因组“完成图”的文件是《 》