問題詳情

【題組】10.
(A) machines and engines are never found in the outer space
(B) spaceships they travel in are full of machines and engines
(C) machines and engines stop working when they leave the Earth
(D) they can build their own spaceships with machines and engines in the outer space

參考答案

答案：B
難度：計算中-1
書單：沒有書單，新增

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