单项选择题
A.eliminate bacteria B.treat bums C.speed up recovery D.reduce treatment cost
A.It is featured by high technology. B.It allows you to imitate famous singers. C.It can automatically alter the tempo and tone of a song. D.It can be placed in specially designed theme rooms.
A.The misery of the factory workers. B.How to survive in a harsh environment. C.Generation gap between the father and the son. D.Love between the father and the son.