阿摩線上測驗
31. What is the primary focus of the article?
(A) Describing the solar system
(B) Discussing Earth's closest neighbors
(C) Explaining natural satellites
(D) Providing details about planets
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統計： A(20), B(30), C(79), D(20), E(0) #3315195
統計： A(20), B(30), C(79), D(20), E(0) #3315195
