【实验步骤】

①选取在实验种植区(与大田生产条件基本一致)处于快速生长期的大小、长势一致的甘蔗植株，每隔10天左右定时（每天上午10:00）取样3个茎尖并固定。

②制作茎尖细胞分裂临时装片:切取茎尖→用卡诺溶液固定5〜24h，再转入体积分数为70%的酒精保存→解离→步骤A→用改良苯酚品红染液处理8〜16min→压片。

③制作装片，观察、统计细胞总数及处于分裂中期的细胞数，并计算细胞分裂指数（有丝分裂中期细胞数与细胞总数的比值）。

【实验结果】

请回答下列问题。

根据短文内容，选择正确答案。

     Dabing and Xiaowei usually go to school by car. They drive past a cinema, a supermarket and a toy shop. The toy shop is next to the supermarket. Yaya and Xiaoli usually go to school by bus. They go past a bank and a post office. The bank is next to the post office. Longlong usually goes to school by bike. He passes by a police station, a library and a swimming pool（游泳池）.

读南极洲图，回答：