◆◇iftrue原则
iftrue在很多考试试题中出现，紧接在Whichofthefollowing之后，有时表达为ifpracticable，ifaccepted，iffeasible，ifcorrect，ifestablished等。这使得选项在即便违反知识或专业常识的状况下，大家也不可以质疑其正确性。应牢记的是：在五个选项内容本身无可质疑的状况下，通过考察推理能否成立，有无缺点，去达成问题目的。段落或选项中所表述的信息、看法或事实是不是正确并非大家所关注的问题。
Pandasarerapidlydisappearingfromthewild.Therefore,inorderTOPreservethespecies,exi
stingpandasshouldbecapturedandplacedinzoosaroundtheworld.
Whichofthefollowingstatements,iftrue,castsmostdoubtontheconclusiondrawnabove?
Whenincaptivity,pandastypicallyproducemoreyoungthantheydointheirnativehabitat.
Newbornpandasinzoosarenotlikelytodiefrominfectiousdiseases,whereasnewbornpand
asinthewildarelikelytodiefromthesediseases.
Sufficientquantitiesofbamboo,thepanda’sonlyfood,cannotbemadeavailableoutsidethepanda’snativehabitat.
Manyzoosareeagertoincreasetheirstockofrareandexoticanimals,buttherearenotenoughpa
ndasforallthezoosthatwantone.
Pandasinzooshaveasmanyoffspringthatsurvivetoadulthoodasdopandasinthewild.
译文：野生大熊猫正在飞速降低。因此，为了保护该物种，应把现存熊猫捕捉起来并放到世界各地的动物园去。
