The other day we were discussing jobs in school. Our teacher, Mrs. White, said it was never too early to think about your life’s work. Most children were really too sure about what they wanted to do. And then Mrs. White asked me, I said, "A truck (卡车) driver."
"Why do you want to be a truck driver, Tommy" she asked.
"Because truck drivers don’t have to sit at the desks all day. They are out on the road and they see a lot of the country. The pay is good, too. And you never have any homework."
The class laughed.
"Well, Tommy. I guess that you don’t like sitting at a desk or doing homework. Is that so, Tommy" Mrs. White answered.
"Yes, I guess so."
"Well, since you are so interested in becoming a truck driver, I think you should investigate (调查) the field a little further (更远，而且). I want you to go to the library and take out a book on truck driving. And I want you to write a report on it and hand in next month."
"That’s the last time I will ever tell anybody my secret idea.\
Why did Mrs. White ask Tommy to write a report Because______.