The Sun and the rest of solar system formed about 4.5 billion years ago from a c

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问题 The Sun and the rest of solar system formed about 4.5 billion years ago from a cloud of collapsing hydrogen gas.

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答案 ∧solar—the

解析表示世界上独一无二的事物，需用定冠词。此处指太阳系。另外还有宇宙the universe、the Milky Way银河等。

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