Generally speaking, a rock concert takes place at about ______.

A．utilizing insulation and sound proofing devices
B．reducing the sources of noises
C．wearing ear protection
D．planting more trees to absorb the noise

A．They place more emphasis on appearance.
B．They both seek the romance than real life.
C．They'd like to attend parties, bars and clubs to meet someone.
D．They pay more attention to financial status.