12.Early critics of Emily Dickinsons poetry mistook forsimplemindedness the surface of artlessness that in fact sheconstructed with such ____.
astonishment
vexation
allusion
innocence
cunning
13.The techniques now available to livestock breeders will continueto be ____,but will probably be ____ by new ones under development.
fruitful.. reversed
refined.. upgraded
inconvenient.. reassessed
used.. supplemented
harmless.. improved
14.There are, as yet, no vegetation types or ecosystems whose studyhas been ____ to the extent that they no longer ____ ecologists.
perfected.. hinder
exhausted.. interest
prolonged.. require
prevented.. challenge
delayed.. benefit
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