阅读理解

A

IfyoutraveltoanewexhibitattheSanFranciscoConservatoryofFlowers*youwillhavechancestoseesomemeat-eatingplants.Takebladderworts(狸藻类植物)，akindofsuchplantsforexam?ple.Theyappearsosmallandgrowinaquietpond.Buttheyarethefastestknownkillersoftheplantkingdomandabletocaptureasmallinsectin1/50ofasecondusingatrapdoor！

Oncethetrapdoorclosesonthevictimtheenzymes(酉每)similartothoseinthehumanstomachslowlydigesttheinsect.Whendinnerisovertheplantopensthetrapdoorandisreadytotrapagain.

Meat-eatingplantsgrowmostlyinwetareaswithsoilthatdoesn'toffermuchfoodvalue.Insuchconditionstheseamazingplantshavedevelopedinsecttrapstogettheirnutritionalneedsoverthousandsofyears.NorthAmericahasmoresuchplantsthananyothercontinents.

Generallyspeakingthetrapsmayhaveattractiveappearancetofooltheeyelikepitcherplantswhichgettheirnamebecausetheylooklikebeautifulpitchers(罐)fullofnectar(花蜜）.

TheAsianpitcherplantforexamplehasbrightcoloursandanattractivehalf-closedlid.Curiousinsectsaretemptedtocomecloseandtakeasipandthenslidedowntheslippery(光滑的)slopetotheirdeaths.

Hair-likegrowthsalongthepitcherwallsensurethatnothingcanescapeandthedigestiveenzymescangettowork.Atinyinsectcanbedigestedinafewhoursbutaflytakesacoupleofdays.

Someofthesepitchersarelargeenoughtoholdtwogallons.Meat-eatingplantsonlyeatpeopleinsciencefictionmoviesbutsometimesabirdorsmallanimalswilldiscoverthatapitcherplantisn'tagoodplacetogetadrink.

1. Ifthetrapdoorofameat-eatingplantisclosedtheplantis.

A. foolinginsectsintotakingasip

B. producingnectar

C. temptinginsectstocomeclose

D. enjoyingadinner

2. Meat-eatingplantscangrowinwetandpoorsoilbecausethey

A. cangetnutritionfrominsects

B. don'tneedmuchfood

C. canmakethemostofsuchconditions

D. havedevelopeddigestiveenzymes

3. Whatcanbecapturedbymeat-eatingplantsforfood?

A. Achild.

B. Adog.

C. Ali