题目

已知多项式﹣3m+m2减去多项式M等于4m2﹣3m+2，求多项式M． 答案：【考点】整式的加减． 【分析】根据题意得出关于M的式子，再去括号，合并同类项即可． 【解答】解：∵多项式﹣3m+m2减去多项式M等于4m2﹣3m+2， ∴M=（﹣3m+m2）﹣（4m2﹣3m+2） =﹣3m+m2﹣4m2+3m﹣2 =﹣3m2﹣2． 七．阅读理解                                    Mark Twain tells a boy’s story in The Adventure of Huckleberry Finn. Huck is a poor child, without a mother or home. His father drinks too much alcohol and always beats him. Huck’s situation has freed him from the restriction of society. He explores in the woods and goes fishing. He stays out all night and does not go to school. He smokes. Huck runs away from home. He meets Jim, a black man who has escaped from slavery(奴隶制). They travel together on a raft(木筏) made of wood down the Mississippi River. Mark twain started writing “Huckleberry Finn” as a children’s story. But it soon became serious. The story tells about the social evil of slavery, seen through the eyes of an innocent child. Huck’s ideas about people were formed by the white society in which he lived. So, at first, he does not question slavery. Huck knows that important people believe slavery is natural, the law of God. So, he thinks it is his duty to tell Jim’s owners where to find him. Later, Huck comes to understand that Jim is a good man. He finds he cannot carry out his plan to inform Jim’s owners of his whereabouts(下落). Instead, he decides to help Jim escape. He decides to do this, even if God punished him. 1. What is the passage mainly about? A. The outline (概要) of The Adventure of Huckleberry Finn. B. The childhood of Huckleberry. C. The reason why Mark Twain wrote the story. D. The effect of slavery. The underlined word “restriction” probably means _________. A. something that you are expected to do. B. something that you are not allowed to do. C. something that you are able to do. D. something that you look forward to. 3. The underlined expression “he does not question slavery” means that ________. A. he is sure about everything of slavery. B. he has no question to ask the owner of the slaves. C. he thinks that slavery is reasonable. D. he believes that slavery is wrong. 4. What can he inferred from the text? A. Huck is a white boy. B. Huck’s childhood is a reflection(反映) of that of Mark Twain’s. C. It ’s Huck’s situation that makes him decide to travel with Jim. D. Huck will be punished by God for what he does. 5. Why does Huck change his mind at last? A. He has made friends with Jim. B. He finds out the weakness of slavery. C. God tells him to do so. D. He finds that Jim is a good man