题目

如图，直线I1：y=x+1与直线I2：y=mx+n相交于点P（1，b）。 （1）求b的值； （2）不解关于x、y的方程组，请你直接写出           的解；（3）直线l3：y=nx+m是否也经过点P？请说明理由。 答案：One day John took two of his friends into the mountains. They put up their tents(帐篷) and then rode off to the forest to see how the trees were growing. By afternoon when they were about ten kilometers from their camp(营地)，it started to snow. A moment later, more and more snow fell. Soon they could hard see the road．John knew there were two roads. One road went to the camp, and the other went to John’s house. But all was white now. Everything was the same. How could he take his friends back to the camp? John had an idea．The horses! Let the horses take them back! But what would happen if the horses took them to the wrong way? That would be a long trip in such cold weather! It was getting late. They rode on and on. At last the horses stopped． Where were they? None of them could tell. John looked around． What was that under the trees? It was one of their tents! 1. John and his two friends went to the forest to          . A．put up their tents                            B．build their camp C．find their way back                                D．see the trees 2. They could hardly find their way back because          . A．there was only one road to their camp B．they couldn’t decide which of the two roads went to their tents C．there was not any road at all in the mountains D．everything was covered(覆盖) by snow 3. Obviously(显然) ，they wanted the horses to take them          . A．to John’ house    B．to the camp    C．to the forest    D．to the mountains 4. The horses stopped because          . A．it was getting late                       B．they were tired after long running C．they had got back to the camp            D．they saw the trees 5. When did the story happen?  It happened          . A．on a cold winter day                            B．on a dark evening C．on a dark afternoon                      D．on a sunny winter day