The old man grew quite curious and replied: “That may be. If a fish can survive in water as dirty as this, it must have a lot of resistance. So it wouldn’t be too strange if such fish had medicinal benefits.”

　　It was clear he was just passing by, so I answered: “Yeah, survival of the fittest. Fish that adapt can survive, just like us humans.”

　　He kept talking to me and didn’t want to leave. He wanted to see whether or not I would catch the small fish with medicinal benefits.

　　21.The text is mainly about ____.

　　A. a research report about pollution.

　　B. an exciting experience of fishing.

　　C. an experience of doing research on pollution

　　D. an unforgettable talk with an old man.

　　22. What is the writer of the text most probably?

　　A. A newspaper reporter.

　　B. A researcher about pollution.

　　C. A fisherman.

　　D. A worker of the textile mill.

　　23. Why did the writer tell the old man he was fishing?

　　A. Because he wanted to satisfy the old man’s curiosity.

　　B. Because the old man was interested in fishing too.

　　C. Because he did the research secretly.

　　D. Because the old man wanted to buy the fish.

　　24. We can infer from the last paragraph that ___.

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