阿摩線上測驗
12.Hanle in Ladakh, northern India, rates "one" (the darkest) on the Bortle scale with 270 clear nights; locals switch off lights to _____ splendid starry skies.
(A)reveal
(B)ignore
(C)replace
(D)block
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統計： A(0), B(0), C(1), D(0), E(0) #3852777
統計： A(0), B(0), C(1), D(0), E(0) #3852777
