47. Which of the following statements is true about space junk?
(A) It is huge, heavy machines.
(B) It never changes position.
(C) It floats slowly around the Earth.
(D) It may cause problems for space shuttles.
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47.以下關於太空垃圾的說法正確的是？ ...
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題目翻譯及解析： 關於太空垃圾，下列哪一...
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