Liquid water only exists The word "fraction" in the second paragraph means

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问题 Liquid water only exists______
The word "fraction" in the second paragraph means______

选项 A、a very small amount.
B、a large area.
C、an important system.
D、a major source of information.

答案A

解析根据文意可以得知该题答案。

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职称英语理工类C级

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