Once an Englishman named Jack Brown went to Russia for a holiday. He stayed there for seve

Once an Englishman named Jack Brown went to Russia for a holiday. He stayed there for several months and then came home again. Some of his friends visited him a few days after he got back. “I had a very dangerous trip while I was in Russia.” Jack said to them. “I wanted to see a friend of mine in the country and the bad weather made me very late. So I was still travelling through a forest in sleigh<雪橇>when the sun went down. It was a long way from my friend’s house when about 20 wolves began to follow my sleigh. It was very dark in the forest. There was thick snow on the ground. It was cold, and there were no houses for miles and miles. First I heard the wolves, and the noise was terrible! The horses heard them, too. They were frightened and began running faster. Then I saw long, grey forms among the trees, and soon the wolves were near us. They were running very fast, and they didn’t seem to get tired like the horses.” “What did you do?” one of his friends asked. “When the wolves got very near,” Jack answered, “I put up my gun and shot the first wolf. The sleigh was moving about, but I hit the animal and killed it. Then all the other wolves stopped and ate it, so our sleigh got away from them for a few minutes.” “Then they finished their meal, and I heard them coming again. The moon was shining brightly on the snow, and after a few minutes I saw them among the trees once more. They came nearer again, and then I shot another of them, and the others stopped once more to eat it.” “The same thing happened again and again, and my horses became more and more tired and ran slower and slower until, after about two hours, only one wolf was still alive and following us.”
“Wasn’t it too fat to run?” one of his friends asked.
【小题1】Jack told his friends what happened to him when he was .A．in England one winter eveningB．in Russia one winter evening C．in America one winter morningD．in Russia one winter morning.【小题2】 In the sentence “They finished their meal.” “meal” here means .A．the food Jack had brought with himB．the meal prepared by Jack’s friends.C．the wolf which had been killed by JackD．the dead animals on the way【小题3】 According to what Jack said, the last wolf . A．had eaten up all the other wolves B．ran much faster than the other wolvesC．was the strongest of allD．was very fat and didn’t run fast.【小题4】From what Jack’s friend said we know that .A．all the wolves had been shot by Jack.B．the last wolf was too fat to run C．Jack was telling the truth D．the friends did not believe what Jack had said.B【小题1】C【小题1】A【小题1】D

(答案→)B【小题1】C【小题1】A【小题1】D 解析：可联系答.案.网客服索取。

就是这个解释

这个答案应该是对的

解：由f（x）=ax+a-x，且f（1）=3得，
a+a-1=3，
所以a2+a-2=（a+a-1）2-2=9-2=7．
故