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

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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