20. What is "Accessibility" in a metro system context?
(A) The cleanliness of the train
(B) The speed of the train
(C) The lighting system inside the metro station
(D) The quality of being able to be reached or entered, often in reference to differently-abled people
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統計: A(8), B(5), C(20), D(178), E(0) #3154196
統計: A(8), B(5), C(20), D(178), E(0) #3154196