题目

已知，则下列结论中正确的序号是__________．；；若，则；④若且，则；⑤若，则. 答案：【答案】①②③⑤【解析】①中分母有理化后即可判断出①正确；②中令即可得到，②正确；③中，可知满足，③正确；④中通过反例，，即可验证出④错误；⑤根据展开式通项，可判断出，，可得⑤正确①中，，①正确；②当时，，可知，②正确；③令，，则 ， ，③正确；④令，，满足，则，④错完形填空(每题1分 共计15分)“Never give up!” It is my law(法则) of my life. It has brought me . I learned the law from my father’s story. My father was in a poor village in the north of Jiangsu, in China. When he was a young boy, he went to school in the morning, then in the fields till sunset. And then he did his homework midnight. Life was hard, because they had no !At the age of 14, my father heard of the United States of America. It was the land of gold, the land where people can become rich.“ don’t I go to America?” he thought to himself, full of hope. So , my father came to America. “ I had thought it was easy to money in America,” he told me. “But when I arrived there, I realized it was not true. They did not like to hire（雇佣） me because I spoke English. Later, I worked in a small restaurant, cleaning up tables, dishes and sweeping the floor. Life was for the first few years. I worked from 10a.m to 11p.m. I wanted to go to school to learn English, but it was impossible. I couldn’t the schooling(学费).My father working hard, and reached his goal.“Alan,” he often says to me, “If you want something, you have to work for it and never give up. Things do not come in life.” That is what I learned from my father.1.A. disaster B. loss C. success D. pity2.A. life B. fashion C. danger D. history3.A. famous B. lucky C. rich D. born4.A. taught B. worked C. studied D. slept5.A. until B. towards C. for D. during6.A. experience B. energy C. time D. money7.A. kind B. poor C. strong D. lazy8.A. What B. How C. Why D. When9.A. discover B. make C. collect D. spend10.A. little B. good C. much D. excellent11.A. giving B. running C. washing D. receiving12.A. comfortable B. cheerful C. nice D. hard13.A. borrow B. need C. afford D. pay14.A. kept B. finished C. minded D. stopped15.A. really B. easily C. quietly D. slowly