在小鱼的血管中流动的血液属于（  ）

用某种纤维素酶催化纤维素水解的实验来探究温度对酶活性的影响，得到如图所示的实验结果．回答下列问题：

根据短文内容, 回答下列问题。
    I am Helen. I study in the No.1 Middle School now. There are forty-five students in my class. All of the students like to travel(旅游). Eight students like to travel by plane, because they think it is fast. It only takes about two hours to travel by plane from Beijing to Shanghai. But some students think taking a plane is too expensive. Twenty-two students usually travel by train. The trains are very fast, but they are cheaper (更便宜). And they can see interesting things through the windows. Fifteen students love to travel by car. Their parents drive them to some beautiful places. They can have a good time with the family. Do you know how I like to travel? I'm one of the twenty-two students.

在新型师生关系背景下，我们可以（    ）

生物膜在生命活动中发挥着非常重要的作用。右图所示的过程不能体现生物膜（　　）