阅读理解. I always avoid going on field inv

题目：

阅读理解.

     I always avoid going on field investigations with the toxics (毒物)team, unless it's absolutely

necessary. It's not that I mind the hard work, or am afraid of coming into contact with toxic

substances. What I fear is quickly losing hope about the work I do.

     However, doing field research with the toxics team, all I see and feel is filth-nothing else. Even

if I close my eyes, I can smell the smell of food processing, rotting organic waste from paper mills

and chemicals from clothing manufacturers.

     One morning, I went to investigate a discharged pipe to document and collect samples of

pollutants secretly being emitted by a textile mill. I had to work with the utmost secrecy in order

to avoid being discovered by the textile mill.

     I dipped a long measuring pole into the large polluting pipe to measure the volume of polluted

water being emitted. But the surface of the water, covered in oil and filth, made me feel as if to vomit.

     All of a sudden, I felt someone hit me on my back. It frightened me so much that I almost fell

into the water. I grasped the pole and looked behind me to see an old man standing there. He

asked: "Can you catch fish here?" I realized that he thought I was holding a fishing pole, so I kept

calm and said: "Yes, I heard that there's a kind of small fish living in this water, and it has medicinal

benefits."

     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.

1. 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

2. 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.

3. 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

4. We can infer from the last paragraph that      .

A. the old man had found out the secret 

B. the old man wanted to catch the fish by himself

C. the writer would have to tell the old man the fact

D. the old man was sent to watch over the writer