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449. The mayor is renowned for her ______ temperament: she can be warm and talkative one moment, aloof, and supercilious the next.
A. acrimonious
B. melancholy
C. mercurial
D. beguiling
E. officious
450. The proposed research projects were praised as both ______ and ______ : they were inexpensive yet promised to break new ground.
A. affordable, redundant
B. pointless, revolutionary
C. economical, innovative
D. suspect, efficient
E. worthwhile, disturbing
