AHuman blood has Ba chemical composition similar to Ca seawater from which our Dancestors first emerged.

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问题 AHuman blood has Ba chemical composition similar to Ca seawater from which our Dancestors first emerged.

选项 A、
B、
C、
D、

答案C

解析 A seawater is incorrect because seawater is definite before the limiting modifier from which our ancestors first emerged. Correction: the seawater.

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托福（TOEFL）

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AHuman blood has Ba chemical composition similar to Ca seawater from which our Dancestors first emerged.

托福（TOEFL）

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