The distance between points 1 and 2 is 3 km. The average yearly rate of the glacier retreat, in the time between when the images were taken, is approximately:
(A)140 m/year
(B)160 m/year
(C)180 m/year
(D)200 m/year5e0d7c8210d63.jpg

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統計: A(1), B(0), C(7), D(2), E(0) #2136995