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https://online2.tingclass.net/lesson/shi0529/0008/8435/EC151.mp3

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

Topics: D.B. Cooper; the Underground Railroad; extend versus expand; God forbid; brown-bag lunch

Words:

to hijack

threat

unsolved mystery

flight attendant

bomb

parachute

in exchange for

frayed

unconvinced

slave

to escape

to be sympathetic toward

to extend

to expand

God forbid

brown-bag lunch