①检测梨汁中是否含有葡萄糖，可加入适量斐林试剂，摇匀后观察颜色变化；②用8%的盐酸目的之一是使DNA与蛋白质分离，使DNA水解；③用苏丹Ⅲ染液使脂质发生颜色变化，呈现橘黄色；④观察线粒体实验操作为：取材→滴加染液→制片→观察；⑤取菠菜叶稍带叶肉的下表皮作为观察叶绿体的材料，是因为下表皮细胞中叶绿体数量少且体积大；⑥罗伯特森电镜下观察到细胞膜的亮一暗一亮结构“三明治”结构模型；⑦在“观察DNA和RNA在细胞中分布”的实验中，酒精灯烘干载玻片，可迅速杀死细胞，防止细胞死亡时溶酶体对核酸的破坏．

    Science museum

    (The Science of Survival, IMAX&SIMEX)

    The Science Museum has something for everyone. Entry to the museum is free. Offer applies to IMAX 3D Cinema, SIMEX and The Science of Survival exhibition only.

    IMAX ￡7.50

    SIMEX ￡4.00

    The Science of Survival ￡6.00

    Opening Times: Daily 10: 00-18: 00 Visit Time: 2 hours

    National Gallery

    Opening Times:

    Daily 10am-7pm Wednesday until 9 pm

    Admission:

    ￡8 adults. ￡4 students, under 12s free

    Tickets:

    Available daily from 10 am

    Telephone: 020 7747 2885

    Visituswww.nationalgallery.com

    ZSL London Z

    There are over 12, 000 amazing animals for you to see. These are just a few things which make a visit to ZSL London Zoo a great day.

    Ticket Price: ￡ 17.00

    Opening Times: Daily 10: 00-17: 30

    Visit Time: 4 hours

有23个△，平均分成4份，每份有____个，还剩____个．

____÷____=____(个)……____ (个)