美语听力 English Cafe 281（在线收听）

　　Topics: Ask an American: Sleep-deprived teenagers; to buy versus to purchase versus to acquire; to burn the candle at both ends; Let’s versus shall we? versus why don’t we?
　　Words:
　　out of it
　　period
　　to stay awake
　　sleep-deprived
　　cranky
　　depression
　　astonishing
　　health center
　　admission
　　fatigue
　　tardiness
　　alert
　　to buy
　　to purchase
　　to acquire
　　to burn the candle at both ends
　　let’s
　　Shall we?
　　Why don’t we?