酵母菌的呼吸作用方式可以用以下两个反应式来表示：

有氧呼吸：C₆H₁₂O₆+6O₂ 6CO₂+6H₂O+能量

无氧呼吸：C₆H₁₂O₆ 2C₂H₅OH+2CO₂+能量

某兴趣小组成员为了探究酵母菌在呼吸作用过程中气体体积的变化（已知相同条件下，分子数相同的任何气体，体积相同），进行了实验．在装有酵母菌和足量葡萄糖溶液的气球中通入O₂和CO₂直到饱和，再注入一定量的氧气，扎紧后放入装有温水的量筒中（如图所示），记下液面的读数，以后每隔一段时间进行观察并记录量筒中液面的读数．请回答下列问题：

能证明乙酸是弱酸的实验事实是（  ）

语法填空

    When I was thirteen, my parents and I visited an eye doctor. After the examination, ____ doctor said with coldness that I had an eye disease. I had inherited it, ____ my brother's eyes seemed to be fine.

    Fifteen years after that, my father began to lose ____ sight and I did, too. I fixed all my attention ____ the effects of my own darkness. My world seemed ____ (break) down and it destroyed all my dreams.

    ____, I learnt new things from my father. Twenty years later, I look back at what he has given me. He taught me the determination to move forward ____ facing difficulties. His journey taught me valuable lessons for my own path in the darkness. He had held onto his faith and moved from his comfortable hometown to this unknown land.

    I did the same as I stepped into the strange ____ (sight) world. Later I gained confidence and learned the language of thankfulness. With great appreciation for my father's example, I learned the powerful combination of faith and insistence and ____ (perform) my own different roles. Luckily, ____ I inherited from my father helped me see my life differently.

如图，下列作图不正确的是（　　）

下列句子划线词语使用正确的一项是  （      ）