課件中的聽力練習取自于劍橋雅思官方指南（Official Guide) 的sample test?
分別是sample test 2 section3 和 test 6 section 2?
China?is?notorious?for?its?heavy?smog. "It's?incredibly?bad."?Denise?Mauzerall,?an?atmospheric?scientist?at?Princeton. "The?air?pollution?in?eastern?China?can?be?so?bad?you?can't?clearly?see?across?the?street.?It?can?feel?like?you're?walking?through?a?heavy?fog?that's?burning?your?lungs."
Thanks?for?listening?for?Scientific?American?— 60 -Second?Science?Science.?I'm?ChristopherIntagliata.