窗口將在 5秒后自動關閉.
a.
同義參見:
以上來源於：《英漢大辭典》
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文法測驗
Kevin had been standing on a ladder trying to reach for a book on the top shelf when he lost his ＿＿＿ and fell to the ground.
(A) volume
(B) weight
(C) balance
(D) direction
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