Passage One Questions 26 to 28 are based on the passage you have just heard.

A．A disease can die, but never come back.
B．Cholera is a disease that doesn’t cause infections.
C．A comeback disease is only restricted in one area.
D．The comeback of a disease is due to a combination of many factors,

A．It requires too much traveling.
B．It limits interaction among students.
C．It will increase class size.
D．It will encourage students to watch too much television.