豆腐起源于安徽省淮南八公山。食用豆腐能获得人体所需要的多种氨基酸，其中含量最多的是亮氨酸(化学式：C₆H₁₃NO₂ ) 。下列有关亮氨酸的说法错误的是（）

一个细胞经过一次分裂后形成两个新细胞，那么经过5次分裂后细胞的数目是（　　）

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

        Doyou have sleeping problems? If so, then these tips may help you fall asleep fast.

        Set aside the thought____ you have to fall asleep. The more you think ____it，the harder you will fall asleep.

        The foods you eat also play ____important part. Avoid eating or drinking things like chocolates, coffee, tea and energy drinks. If you have to, then have them in the morning and never in the afternoon,____ (especial) before going to bed. Don't eat too much at night. A full stomach will make it more difficult for you ____(fall) asleep because your body is working more time to digest the food you ate.

Makea ____(fix) time to go to bed.For example，by 9 o'clock in the evening you should already be in bed. Do this even if you're not sleepy yet. Once ____(follow)this routine, you will gradually see that you feel ____(sleep) when it's 9 o'clock.

        Make your room comfortable for sleeping. You should also take note that the sleeping environment also affects your sleep. It must be in the room ____it's not noisy. Otherwise, you will find ____difficult to fall asleep again after waking up.

材料一：《国民经济和社会发展第十二个五年规划纲要》把建设“资源节约型、环境友好型”社会作为转变经济发展方式的重要着力点。
材料二：“谁知盘中餐，粒粒皆辛苦”。******关于“厉行勤俭节约、反对铺张浪费”的讲话在互联网上引起强烈共鸣。为了更为有效地反对浪费,不少网民在网络上发起以吃光盘子里的东西为主题的“光盘行动”。
结合上述内容，学校初三年级（1）班学生开展了一次实践探究活动，请你与他们共同完成下列任务。