铁是经济发展中不可或缺的因素。丙国和丁国的钢铁产量与经济一起增长，丁国是世界上每生产1吨铁耗能最低的国家之一。读图，完成下面试题。 甲
He realized she was crying ________ what he had sad. A. because B. because of C. as D. since
已知函数f（x）=3sin（2x﹣），则下列结论正确的是（ ） A．f（x）的最小正周期为2π B．f（x）的图象关于直线x=对称 C．函数f（x）在区间上（﹣，）是
最能体现1787年宪法民主性的是 A 三权分立 B 确立新型共和国 C 人民有言论、出版、集会的自由 D
I was in my first year of college, making friends and enjoying life, but then my whole world turned upside down. I had a heart attack. It felt like someone was stabbing (刺) me in the chest wit
2014年12月12日召开的国务院常务会议，确定了新一批简政放权措施，进一步促进转变政府职能、建设现代政府。而转变政府职能的核心要义，是要切实做
学校即将举行以“Turning a bad mood（心情）into a good one”为题目的英语作文比赛，请按下列要求写一篇100词左右的记叙文或议论文。 议论文
He did well in the examination. He _____ hard at his lessons.. A. must have worked B. can have worked C. will have worked D. has worked
