To keep fit， he would rather sit than______.

如图表示雄果蝇体内某细胞分裂过程中，细胞内每条染色体DNA含量变化（甲曲线）及与之对应的细胞中染色体数目变化（乙曲线），下列有关叙述正确的是（　　）

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                                                                                                  冰壶洞
                                                                                                明 胡应麟
                                                                                 一线悬崖鸟道通，石床钟乳斗玲珑。
                                                                                 飞流万尺无人到，谁宿庐山此洞中。