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https://online2.tingclass.net/lesson/shi0529/0008/8435/EC394.mp3

https://image.tingclass.net/statics/js/2012

Topics: The rise of home shopping; Mammoth Cave National Park; quick versus fast; tremendous versus enormous; basic needs

Words:

catalog

to take off

to showcase

line

allure

customer base

bricks-and-mortar store

cave

mammoth

extinct

lantern

to mine

to spelunk

quick

fast

tremendous

enormous

basic needs