IV-4 A

1；cost-less；priceless；valueless；worthless

2；valuable；invaluable；precious； valueless

3；consolidate；segregate；differentiate；eradicate

4；define；refine；definitive；infinitive

5；insane；crazy；mad；disorder；abnormal

6；ozone；ooze；zoo；cozy

7；ecological；economical；expenditure；expensive

8；thermos；thermometer；thermostat；geothermic

9；reverse；diverse；converse；adverse

10；regime；regimen；regiment；region

11；parameter；barometer；thermometer；diameter；

12；parameter；parachute；parasite；paramount

13；negligible；illegible；legible；intelligible；ineligible；eligible；tangible

14；saw；was；awe；owl

15；habitual；inhabit；habitat，inhabitant

IV-4B

1；debris；ruin；wreckage；residue

2；converge；diverge；emerge；submerge；merge

3；plea；pea；flea；flee

4；overpass；surpass；bypass；compass

5；vulgar；vague；vulnerable；virginal

6；grave；graze；grate；grade

7；slaughter；butcher；massacre；holocaust

8；repressive；aggressive；oppressive；progressive

9；hunch；；lunch；brunch；bunch

10；attach；detach；attract；distract

11；greasy；fatty；oily；obese

12；peer；peel；peep；peek

13；flap；flip；clap；clip

14；explore；deplore；implore；employ

15；numb；thumb；dumb；lump

16；humidity；humanity；humility；humiliate

Text B：What nature is telling you（录音与翻译）