Passage Two Questions 29 to 31 are based on the passage you have just heard.

A．150 healthy people.
B．150 unhealthy people.
C．300 patients.
D．300 people.

A．Dyes the plastic for colored products.
B．Makes bowls and cups and things.
C．Produces shampoo bottles, car handles, and so on.
D．Manufactures plastic things.