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题目材料:

Consider each of the choices separately and select all that apply.

The author suggests that the burning of fossil fuels has had which of the following effects on the efficacy of carbon dating techniques?
  • AIt may increase the carbon-isotope mix of the object being dated.
  • BIt may make items subjected to carbon dating appear to have died later than is the case.
  • CIt may tilt the fragile equilibrium activity of living matter.

B显示答案

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