阿摩線上測驗
48. The tough outer covering of the eye is mainly referred to as the ____.
(A)sclera
(B) retina
(C) pupil
(D)iris
(E)fovea
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統計： A(37), B(6), C(2), D(2), E(1) #2430342
統計： A(37), B(6), C(2), D(2), E(1) #2430342
