填空题 Directions: In this section, you will hear a talk. Answer the questions below. You will hear the recording twice. At the end of the talk there will be a 3-minute pause, during which time you are asked to write down your answers briefly on the Answer Sheet.

填空题 What is the speaker's field of work?

填空题 Where does this talk probably take place?

填空题 What is the main topic of the talk?

填空题 What are the speaker's assistants doing?

填空题 According to the speaker, what is the one cause of the salmon's problem?