题目内容：

My friend, Peg, and I were seeking evidence that there were people who were treating our soil, our waters, our air with the love and respect they deserved.  And we found it.

One day we saw a busload of school children on an outing. The bus had stopped at a hamburger stand where we were having a rest, and half-a-hundred children poured out. Busloads of children, of course, were not new, and I hardly gave them more than a glance until I realized what they were doing.  Chatting and laughing, the children were picking up as much waste as they could carry from around the stand and its parking area. They took the waste to their bus, where several bags had been brought out for the waste.

Within five minutes, before our astonished eyes, that parking lot had been picked clean.  Impressed, I walked over to their teacher. "I'm interested," I began. "In fact, I'm surprised at how those kids worked this place over. Is this some kind of environment protection class?"

"You'd never guess it," he said, "but we're a history class. "

"A history class?"

"That's right. We're on our way from Boston to visit Fort(城堡) Ticonderoga. Before the trip, one of the things we tried to find out was how the Ticonderoga countryside looked back in old days," he said. "In fact, we made a little table display of the scene, using toy buildings and toy trees. When one kid jokingly suggested we ought to put a few bottles and cans around to make it look real, the others blamed him. But the boy argued that he bet Ticonderoga would look like that today. Besides, if they thought it was so funny, were they prepared to clean it up if he was right? The class decided, however, that the entire fort might be too big a task to do. But they agreed to clean up any roadside area where they stopped on their way to the fort. And so that's what they did!"

1.How did the author feel when he understood what the kids were doing?

A. Amazed.

B. Bored.

C. Disappointed.

D. Unconcerned.

2.Why were the students going to Fort Ticonderoga?

A. To learn history.

B. To go outing for fun.

C. To clean the roads to the fort.

D. To protect the environment there.

3.The underlined word "display" in the last paragraph refers to__________.

A. plan

B. show

C. cloth

D. game