tpo9‐3geologynormalEmpty Quarter, limestone, two periods, recent lakes and ancient lakes,sanddunes, particles form pan
tpo9‐4linguisticnormalonly human have language,coyote,discreteness, productive
tpo10‐1marine biologynormalwhales evloved from land animals, hippo, pakistan fossils
tpo10‐2european historynormalpotato tomato transfer from Mexico to Europe, power center shift from south to north
tpo10‐4psychologynormaleary memory of babies, Piaget's theory, 9 months baby has memory
tpo11‐1biologynormalbirds' parenting, distraction display, fake as wounded,protect youth
tpo11‐3environment sciencenormalwetland turned into dry farmland in Florida,climate change, El Nino
tpo12‐1biologynormalskin cell,nerve cell,junk DNA,chromosome, telemere, protective shoelace
tpo12‐4environment sciencenormalhow do we tap solar energy, gather and store,power plant, only time will tell
tpo14‐2biologynormalmicroclimate,squirrel
tpo14‐3astronomynormalnavigation,tropic,polynesian,stone canoe, star pair
tpo14‐4archaeologynormalpassage graves, astronomical calendar, echo,standing wave,resonance
tpo16‐1geologynormallimestone cave, sulfuric acid, carbonic acid,bacteria eat oil, wear mask because of smell
tpo16‐2music historynormalpiano, harpsichord,percussion,upper class,women learn to play
tpo16‐3biologynormalbeaver,distant log or nearby log,save energy or evade predator
tpo16‐4art historynormalstain glass,church,paint on glass
tpo17‐1art historynormallimitations of dating techs,lady with a hood,strata,carbon dating,genre
tpo17‐3historynormalNile River,calender
tpo17‐4biologynormalanimal defense mechanism, Octpus,relaxed or contracted sacks,ink cloud
tpo18‐1astronomynormalsun spots, Galileo,cloud hypothesis,magnetic,40 years observation
tpo18‐2art historynormalRoman copy ancient Greek's statues,Roman admire Greek,coins stamped with emperor's icon
tpo18‐3european historynormalsignificance of spice,Roman empire collapse‐trade indirect,expensive,spoiled meat
tpo19‐3marine biologynormalSpartina,osmosis,form colony to withstand storm
tpo19‐4portraitnormalpainter's own interpretation
tpo1‐4biologyeasyEastern and Olympic Marmot,aggressive,family oriented
以上就是关于“托福TPO听力难度系数表”的内容，想要更好地申请留学，那么大家在备考的过程中，就要更好地提高我们的语言成绩，这样在我们之后的申请中才能有更大的帮助。小编也提前预祝大家能够取得高分成绩。