21. Bike __________ means being mindful of others who share the road with you, including pedestrians,
motorists and other bicyclists.
(A) etiquette
(B) platform
(C) candor
(D) innovation
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統計: A(154), B(33), C(27), D(17), E(0) #1345914
統計: A(154), B(33), C(27), D(17), E(0) #1345914