单项选择题

The ______ of sediment in the river caused concern among environmentalists and industrialists alike; the water levels in the river were being reduced almost daily.

(A) accretion
(B) disposal
(C) catalyst
(D) alienation
(E) ethnology
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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
单项选择题
ENIGMATIC:
(A) abstruse
(B) puzzling
(C) enlightening
(D) disconcerting
(E) worrisome
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