随着各种探测器靠近或登陆火星，人们对火星有了更深的了解。火星大气中95%是二氧化碳，其余为少量的氮气、氢气，还找到了有液态水的证据。根据以上信息，下列推断错误的是：①火星大气是纯净物 ②火星与地球大气成分相同 ③火星上钢铁容易生锈 ④火星上一定存在生命 ⑤火星上温室效应一定显著（）

下列铁路线中和长江交于南京的是（　　）

I will never forget my first English class. It is very interesting. It's the first class in the morning. The teacher goes into the classroom with a smile on his face. At the beginning, he makes a self-introduction(自我介绍). And he tells us that his English name is John. Then he asks all of us to think of English names for ourselves. We are very excited(兴奋的) to find a good name. Then he asks us to write our names down on a piece of paper. I think about my English name for a long time. Then I come up with(想出) a beautiful name ---Shirley. All the students write their names down and give the paper to the teacher. When the teacher calls “Shirley” to answer his question, three girls stand up at the same time.