◆◇iftrue原則
iftrue在許多考題中出現，緊接在whichofthefollowing之後，有時表達為ifpracticable，ifaccepted，iffeasible，ifcorrect，ifestablished等。這使得選項在即使違反常識或專業知識的情況下，我們也不能質疑其正確性。應牢記的是：在五個選項內容本身無可質疑的情況下，通過考察推理能否成立，有無缺陷，去實現問題目的。段落或選項中所表述的信息、觀點或事實是否正確並不是我們所關注的問題。
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.
譯文：野生大熊貓正在迅速減少。因此，為了保護該物種，應把現存熊貓捕捉起來並放到世界各地的動物園去。