18. It can be inferred from the passage that the author would most likely describe the additional evidence provided by experiments with adrenergic antagonists as
revolutionary
disappointing
incomplete
unexpected
corroborative
19. The passage provides information about which of the following topics?
The mechanism by which glucose affects memory storage
The evidence that prompted scientist to test the effects of adrenaline on memory regulation
The reason that the effects of glucose on memory were tested
The ways that memory storage modifies the structure of the brain
The kinds of training used to test memory enhancement in rats
20. The author refers to the results of the experiment using adrenergic antagonists as negative findings most likely because the adrenergic antagonists
failed to disrupt adrenalines effect on memory
did not affect glucoses ability to enhance memory
did not block adrenalines ability to increase blood glucose levels
only partially affected adrenalines ability to enhance memory
disrupted both adrenalines and glucoses effect on memory
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