21. What is the passage mainly about?
(A) Space X the technology company
(B) Satellites and their contribution to communication
(C) The problems with too many satellites in space
(D) What satellite constellations really are
詳解 (共 2 筆)
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美國科技公司 Space X 於 202...
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定位關鍵字破解:第一段最後:But as...
私人筆記 (共 1 筆)
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But astronomers say ...
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