酵母菌在有氧时进行有氧呼吸，无氧时进行无氧呼吸，将酵母菌放在含有培养液的密闭的锥形瓶中，测得CO₂的释放量是O₂的吸收量的3倍，则有氧呼吸与无氧呼吸消耗葡萄糖的比为（   ）

完形填空

    Mr. Wu is having a class in Class Five．He is asking students to think about(思考)  1  future 1ife．Here are some students' opinions(观点)．  

    Zhang Wei thinks people will live in the2like fish．because in the future people will 3organic silicon(有机硅)to breathe(呼吸)in the sea．And people will build 4and schools in the sea．Then they can see doctors and go to school．He

thinks life in the sea will be very 5  and comfortable．

    Luo Li thinks  6 in the future will be great．Every family will have a car．And these cars will 7  in the sky．People will drive cars to their offices．

  Wang Kai thinks machines like robots will do work for people,   8  people will have more 9  time to enjoy life．He thinks people will have short winter holidays but long  10holidays because the summer will be very long．