people watched Shenzhou Ⅸ spacecraft into space successfully in the world.A. Billion B. BillionsC. Billion of D. Billions of D [解析]句意:世界上数十亿人观看了神舟飞船成功进入太空.billion名词.十亿,固定搭配billions of.意为“数十亿 .表示题目和参考答案——青夏教育精英家教网—

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people watched Shenzhou Ⅸ spacecraft into space successfully in the world.

A. Billion B. Billions

C. Billion of D. Billions of

D 【解析】句意：世界上数十亿人观看了神舟飞船成功进入太空。billion名词，十亿；固定搭配billions of，意为“数十亿”，表示约数。故选：D。

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