阿摩線上測驗
31. When the visibility is reduced to about 4 miles, in practice, we say that visibility is:
(A) exceptional
(B) good
(C) moderate
(D) poor
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統計： A(13), B(49), C(228), D(107), E(0) #3407500
統計： A(13), B(49), C(228), D(107), E(0) #3407500
