According to the passage,Edison believed the phonograph could be use to improve all of the following EXCEPT.
a.business communication
b.musical entertainment
c.speed of mail delivery
d.education
ANS:c
但為何不是d呢?小弟在文章中沒看到有education的部份,應該是沒找到呢,不知是否有好心人可以提示一下,謝謝喔~
