步骤一：取2克高活性干酵母放于烧杯中，加入200毫升的32℃的质量分数为5%的葡萄糖溶液，搅拌使其均匀混合。

步骤二：取两支相同的注射器，编号为A和B，在注射器内分别抽取30毫升酵母菌培养液，B号注射器再抽取30毫升空气，振荡几次；

步骤三：用橡胶管分别连接注射器和装有BTB试剂的试管，5分钟后观察实验现象。

步骤四：将注射器内的酵母菌培养液分别倒入烧杯中，加入酸性重铬酸钾溶液，观察实验现象。

查阅资料：

①BTB试剂在中性环境中呈淡蓝色，在酸性环境中呈黄色；酸性重铬酸钾溶液呈橙色，遇酒精变成灰绿色。

②有氧呼吸：葡萄糖+氧气→二氧化碳+水+能量

③无氧呼吸：葡萄糖→二氧化碳+酒精+少量能量

    I was sitting at the kitchen table finishing my morning meal. A little taste of autumn1had risen in my soul. The2 air and falling leaves all 3 the coming of the winter. I took my last drink of meal and carried my4 bowl over to the sink to clean it. My two cats sat on top of the kitchen counter,5 above them. I saw that they were both eyeing a tiny spider on a single web from the light above. Just as the spider came near,6cats were well prepared to catch and eat him. I quickly took a paper towel and 7 the little guy before he became a kitty 8I walked out of the back door to let him 9. As soon as I set him down he quickly crawled to 10on the wall. As I shut the door, I noticed something too. I was 11and my sadness was gone.

    Now I know a lot of people would be 12 about how saving the eight-legged animal could have 13my spirits, so quickly. After all, it was just a spider. As I thought about it, two sentences I had recently read 14me. The first was: “The only true thing is 15” The second was: “ Do everything out of love.” I realized then that no act of love is 16 I had only spared a spider to live another day, but it had 17my heart and improved my spirit.

    Make your life full of love. When you do so, you will18not only yourself, but others and this world. Your soul will 19 the cheers of other people.20 people's eyes every smile you share is a treasure, and every kind act you do is a triumph(胜利).