1. Scientists find that smoking can ______ short-term memory, or even ability to remember recently learned information.  （A) impeach  （B)impede  （C)improvise  （D)import

2. Public opinions sometimes can be _________ so many things cannot be trusted or accepted at face value.  （A)spurious  （B)stingy  （C)succinct  （D)exuberant

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