题目

逻辑推理是化学学习中常用的思维方法，下列推理正确的是（ ） A. 化合物是由不同元素组成的纯净物，所以由不同种元素组成的纯净物一定是化合物 B. 中和反应生成盐和水，则生成盐和水的反应一定是中和反应 C. 单质中只含有一种元素，所以只含有一种元素的物质一定是单质 D. 活泼金属能与稀盐酸反应放出气体，则能与稀盐酸反应放出气体的物质一定是活泼金属 Ⅰ．听下面5段对话，选择正确答案，每段对话请听一遍。 1．What book has the woman bought? A．A history book． B．An English book． C．A book for a music course． 2．When will Susan come? A．4∶30． B．4∶45． C．5∶25． 3．Where does the man live? A．In New York． B．In Washington D．C． C．In Boston． 4．Why isn't the woman going to the movie? A．She has seen it already． B．She hasn't got a ticket． C．She has to go and see the doctor． 5．What do we know about Bob? A．He often does his homework with others' help． B．He is interested in maths． C．He often forgets his homework． Ⅱ．听下面一段对话，在空格上填入所缺的单词，使短文完整，短文请听两遍。 Hello!Greetings from the 　　1　　!My name's Mekanika and I live in the year 3044．Well, that's what you would can it．We can it the year 58 AL．AL means“After 　　2　　”．You see, 58 years ago, people on the earth decided that they had to do something to 　　3　　 the people on the planet．There were so many people on the earth, and there was so much 　　4　　, that the only way to keep the planet from 　　5　　 was to 　　6　　 people into space．My family was one of the 　　7　　 ones．About one third of the earth's population was left 　　8　　 home, and the rest of us went into space．We are now living in a new city on the planet Mars．Life here is very nice, and we are happy in our home．We still keep in 　　9　　 with the people on earth and some of us go back home and are doing their best to clean up the plant．My grandparents and parents tell me 　　10　　 the earth and it sounds like a beautiful place．When my 　　11　　 teacher told me that we could use our school's time machine to send messages to the past, I want to send one to you and tell you about life here．