• A．Booming business of Circuit City
• B．Superior quality of conventional DVD discs
• C．An introduction of the new system Divx
• D．Unlimited or permanent play of Divx discs
  E Disk-play tracking and billing systems
  F Expansion of the titles of Divx discs

Paragraph 4______

A．how to write a travel book
B．the literary style of three early travel writers
C．why people find travel writing exciting
D．where three early travel writers went and wrote about