13. An/A __________ is the set of systems within a place or organization that affects
how well it operates (for example, a public transport system or road system).
(A) arable land
(B) amenity
(C) outskirt
(D) infrastructure
(E) urban sprawl
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統計: A(1), B(0), C(0), D(2), E(0) #3097629
統計: A(1), B(0), C(0), D(2), E(0) #3097629