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De Amaronrainfores is as undisturbed a place as most people can imagine,bven there.theffeeofachanging climate are playing out.Now,research auggests thatmany of the region's most sensitive bird species are starting to evolve in response towarming.Birds are often considered sentinel (species meaning that they indicate theoermiheaihofamcovsem.soecinieaeneulnynereeohoheresponding to climate change.In general,the news has not been good.For instance,abthe National udbon Soey found hat more thn wo-thirds fNAmercbird speciill be ndanger of by10 if warming trendsoFor the ewstudyrerhers colleted the biggest dataset sfar on the Amazoon their current course.resident birds.represetrspecies and lasting the years from101.During the study period,the average temperature in the regionoe,while thefrainfall deelined,making fora hotter,dryer climate overallAording totheNoveber 12 in the jourl Science Advances,36 species have lost substantieightas much percent of their body weight per decade since Meanwhilethe species showed some decrease in average body mass,w a third grew longerBecause of the study's long time series and large sample sizes,the authors were ablewings.to show the morphological(形态学的)effects of climate change on resident birds..However,the researchers themselves are unsure and wonder what advantage the winglength changes give the birds,but suppose smaller birds may have an easier time keepingcool.In general,smaller animals have a larger rate of surface area to body size,so theydissipate more heat faster than a bigger animal.Less available food,such as fruitorinsects,in dryer weather might lead to smaller body size.32.Why are scientists fond of doing research on birds?A.They have small body sizes.B.They are sensitive to hot weather.C.They live in an undisturbed rainforest.D.They are ecological balance indicators.33.What can we learn from the new study?A.A third of species have been extinct for a decade.B6 speces of their body weighteveryC.Two thirds of species showed a considerable decrease in weight.D.About 26 species responded to climate change with longer wings.英语·试题卷七第7页（共12页）