Announcement
The swimming pool of Shanghai University will be open to the public on July 10th this year.
Time: 8:00 a.m.—8:00 p.m.
Fee: RMB 2 yuan/hr for an adult
RMB 1 yuan/hr for a child
Please bring your own swimming suits.
Shanghai University
How much will a grown-up pay if he stays in the swimming pool for 2 hours
______

A. why "Good Morning to All" was replaced by "Happy Birthday to You"
B. how the song "Happy Birthday to You" was composed
C. the history of the song "Happy Birthday to You"
D. why the song "Happy Birthday to You" is popular