碳碳三键的不饱和度

Great changes have taken place in my hometown since 1930.请问句子中的Great changes是什么意思? Since the past eight years,great changes ___________(happen) in our hometown. 英语翻译要不要加 S 复数? "生与死"的英文怎么译啊? 免费英语小故事小红帽英文版100字左右 无论生与死 我都与你在一起 英文怎么翻译? 对于小红帽这个故事的总结要英文的 英语故事小红帽,短短短! 求小红帽的故事,英文的 介绍哲学入门书 哲学方面入门书籍介绍~!给我介绍几本!谢了! 谁能给我介绍一本初学哲学的书籍我想学一些哲学,来平静自己,但是不知道看什么书 求 初学哲学 请介绍点西方哲学的入门书./ 想学哲学,请懂的朋友介绍几本入门书籍!最近对哲学发生兴趣,想学一点这方面的知识,希望学过哲学的朋友介绍几本哲学基本的入门书籍,由浅至深,循序渐进的.不要全部介绍哲学经典,那样我 since years ago用于什么时态 SINCE TWO YEARS AGO的同义句 现在完成时练习一  用since和for填空 1.______ two years 2._______ two years ago.3_______last month 4._____1999 5.______yesterdy 6._____4o'clock 7._____4 hours8._____an hour ago 9._____we were children 10.____-lunch time 11._____she 他离开南京两年了 he —————————— since two years ago They ___(live) there since two years ago用正确形式填空1.They ___(live) there since two years ago.2.No___(park) means you can't park your car here.3.My cousin is interested in fruit_____(farm).4.He wants to continue his____(study)after senior h 这个图的S点是北极还是南极呢? 这个图怎么判断磁体的南极和北极 地理南极在地磁北极的左边还是右边,给个图 推荐几本有关人类的心理的书 求人类行为心理学书籍本人想自学 .我们老师叫我们找一本跟社会心理学、人类行为有关的书籍看看,写读书报告,我想找一本有趣味性的书 改为一般疑问句：My Hometown has changed a lot since 1998._____　____　hometown ____ a lot since 1998? My hometown has changed a lot during the past ten years.改为同义句There ________ ________ a lot of ________ in my hometown during the past ten years.急! My hometown has changed a lot.____ ____ hometown ____ a lot?Yes,____ ____.No,____ ____. My hometown has changed a lot in the p_ few years. over the past ten years ,Our hometown has changed a lot .中over咋回事 图为南极俯视图,图中四个平行箭头指向东方的是选项：A.① B.② C.③ D.④ 这个图的俯视图怎么画啊