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【单选题】
Read the following expression chosen from academic introductions, and identify what part of an introduction it refers to：The remainder of the paper is organized as follows: Section II gives a general description of NOMA with SIC. Then Section III details the proposed iterative method for spectrum optimization. Simulation results are given in Section IV, and Section V concludes the paper.A.
Problems with existing studies
B.
Description of the skeleton of the research
C.
Existing studies on the problem
D.
Research contents
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