单选题：根据以下材料，回答题。What does the writer say about tap water? Which o

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根据以下材料，回答题。

What does the writer say about tap water? Which of the following is NOT correct?
A．Tap water reflects the concentrations of hydrogen and oxygen isotopes in different regions.
B．Tap water is a kind of soft drink in the United States.　　
C．Tap water contains unique proportions of isotopes of hydrogen and oxygen.
D．Tap water is used to cook food.

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