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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【翻譯】為什麼科學家們一開始不在意太空垃...
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題目翻譯及解析： 為什麼科學家一開始對...
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