阿摩線上測驗
40. The main purpose of the article is to ____.
(A) explain defects in the eye
(B) describe functions of the optic nerve
(C) make you conduct experiments
(D) make you appreciate how your eyes function
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統計： A(7), B(16), C(28), D(116), E(0) #939746
統計： A(7), B(16), C(28), D(116), E(0) #939746
