题目

Like a lot of young people. Joanna Rakoff took the first job she was offered. She decided to work at one of New York’s oldest literary agencies. Yet she had no idea that it would be the first stepping stone on the way to becoming a writer, and later, the novelist she is today.In the face of the ups and downs, she gave it her all. She can still remember that her boss was very challenging. “The thing that worked when my boss was being difficult was remembering it wasn’t personal. Usually, it’s not about you, it’s them,” she advises anyone in a similar situation.Being a manager and ed李明同学用显微镜观察小鱼尾鳍内血液的流动并绘出如图，请根据实验的方法步骤和现象，回答下列问题．（1）该实验在选择活小鱼时，应选尾鳍色素少的，这是因为 ．（2）通过图，可判断标号B的血管是 ，判断的依据是 ．根据血液的流动情况，可判断A为 （填动脉或静脉）．（3）实验后，应将小鱼 ．