单项选择题

Running a marathon is an ______ task, taking months of both physical and mental preparation and training before actually running a grueling 26.2 miles.

(A) arduous
(B) ambiguous
(C) involuntary
(D) eloquent
(E) overt
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单项选择题
ENIGMATIC:
(A) abstruse
(B) puzzling
(C) enlightening
(D) disconcerting
(E) worrisome
单项选择题
BRAZEN:
(A) insolent
(B) prudent
(C) uncouth
(D) undaunted
(E) materialistic
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