在有氧呼吸的全过程中，CO₂的形成发生在（　　）

                                                                                                            兰溪棹歌^①
                                                                                                               戴叔伦
                                                                                     凉月如眉挂柳湾，越中山色镜中看。
                                                                                     兰溪三日桃花雨，半夜鲤鱼来上滩。
                                                              【注释】①兰溪，在今浙江兰西县西南。棹（zhào）歌：船歌。

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