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◆◇iftrue原则
iftrue在许多考题中出现，紧接在Whichofthefollowing之后，有时表达为ifpracticable，ifaccepted，iffeasible，ifcorrect，ifestablished等。这使得选项在即使违反常识或专业知识的情况下，我们也不能质疑其正确性。应牢记的是：在五个选项内容本身无可质疑的情况下，通过考察推理能否成立，有无缺陷，去实现问题目的。段落或选项中所表述的信息、观点或事实是否正确并不是我们所关注的问题。
Pandasarerapidlydisappearingfromthewild.Therefore,inordertopreservethespecies,exi stingpandasshouldbecapturedandplacedinzoosaroundtheworld.
Whichofthefollowingstatements,iftrue,castsmostdoubtontheconclusiondrawnabove?
(A)Whenincaptivity,pandastypicallyproducemoreyoungthantheydointheirnativehabitat.
(B)Newbornpandasinzoosarenotlikelytodiefrominfectiousdiseases,whereasnewbornpand asinthewildarelikelytodiefromthesediseases.
(C)Sufficientquantitiesofbamboo,thepanda’sonlyfood,cannotbemadeavailableoutsidethepanda’snativehabitat.
(D)Manyzoosareeagertoincreasetheirstockofrareandexoticanimals,buttherearenotenoughpa ndasforallthezoosthatwantone.
(E)Pandasinzooshaveasmanyoffspringthatsurvivetoadulthoodasdopandasinthewild.
译文：野生大熊猫正在迅速减少。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。 | 
