阿摩線上測驗
46. Why were scientists NOT concerned about space trash in the beginning?
(A) It no longer served any useful purpose.
(B) It was millions of miles away from the Earth.
(C) It did not cause any problems.
(D) It was regarded as similar to comets and stars.
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統計： A(23), B(26), C(59), D(19), E(0) #490910
統計： A(23), B(26), C(59), D(19), E(0) #490910
