阿摩線上測驗
19 During the mating season, male great bustards develop a ______ change in color on their necks, from the usual plain grey to a two-tone pattern of white and brown.
(A) suspicious
(B) conspicuous
(C) protruding
(D) secreting
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統計： A(1), B(18), C(5), D(1), E(0) #2995986
統計： A(1), B(18), C(5), D(1), E(0) #2995986
