- 問題詳情: Thousandsofyearsago,itwascommontoseemanystarsinthesky.However,thischangedwiththe61(invent)ofelectricity.Citieshavegone62(bright),usingmorelights.Andthatmeansmostpeopleinurbanareaswillneverseebeautifulgroupsofstars.Theywillneverseea63(na...
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