167. Evidence that the universe is expanding ______ our perception of the cosmos and thus caused a ______ in astronomical thinking.
A. advanced, setback
B. altered, revolution
C. contradicted, truce
D. reinforced, crisis
E. halted, breakthrough

168. Although the theory that widespread lead poisoning contributed to the decline of the Roman Empire has gained ______ , the evidence is still ______ .
A. credence, irrefutable
B. disrepute, dubious
C. acceptance, convincing
D. momentum, systematic
E. currency, inconclusive

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