Question
15 to 20 are based on this passage
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Question 15
It can be inferred that the geologic features found in the light areas of Ganymede were probably formed
A. subsequent to the features found in the dark areas.
B. in an earlier period than those in the dark areas.
C. at roughly the same time as the features found in the dark areas.
D. primarily by early bombardment.
E. by the satellite's volcanic activity.
我的答案： 无