Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．Because they want to sell canteens.
B．Because they want to educate the tourists about park conditions.
C．Because the tourists may get sick or die from dehydration.
D．Because the tourists may get lost.

A．develop the type of hearing loss like much older adults
B．expose themselves to music for longer periods of time
C．use portable players more time and turn up the volume
D．spend much more time listening to their music players