Quote:
The economists were _______ to find that the theory that they had considered __________ crumbled when modern techniques for economic modeling made it possible to make new kinds of observation that contradicted its fundamental assumptions.
A) surprised . . problematic
B) overjoyed . . useful
C) stunned . . invulnerable
D) disappointed . . faulty
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In this question,clue words are "
made it possible to make new kinds of observation that contradicted its fundamental assumptions"The economists considered the theory as useful fragments to make such new observations.If it were invulnerable, faulty, or problematic, then this theory couldn't have produced such results;hence the economists were overjoyed.