单项选择题

Which of the following statements about net present value (NPV) and internal rate of return (IRR) is accurate?

A．An IRR graph with NPV on the 'Y' axis and discount rate on the 'X' axis will have a negative slope.
B．Two NPV calculations are needed to estimate the IRR using linear interpolation.
C．The graphical approach to IRR is only an estimate; linear interpolation using the formula is required for a precise answer.
D．The IRR is unique.

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单项选择题全球吸毒人数多达2.75亿人，其中大多数是（）

A.未成年人
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