there have been many great inventions 为什么用have

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• 一片英语科技短文的选择here have been many great inventions, things that changed the way we live in. The first great invention was one that is still very important today一the wheel. This made it easier to carry heavy things and to travel long distances. For hundreds of years after that there were few inventions that had as much effect as the wheel. Then in the early 1800's the world started to change. There was little unknown land left in the world. People did not
• 阅读短文,在空白处写出各单词的正确形式,单词的第一个字母已给出(初二)There have been many great inventions that changed the way we live.The f____ great invention was one that is still very i____ today----wheel.This made it e____ to carry heavy things and to travel long distance.For hundreds of years after that there were f____ inventions that as important as the wheel.Then in the early 1800's the world started to c_____.There was l_____ unknown land left in the world.People didn't hav
• 谁能帮我找到'文章开头为there have been many great inventions,things that changed the way we live
• There have been many great inventions, things that changed the way we live in. The first great inven
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• 11.People might avoid many accidents ________ these methods been adopted before.A.that B.were C.have D.had 12.________arose the problem that the boy will never overcome the great difficulties.A.It B.This C.Here D.Those
• all in all/ in a word 是否有区别?In a word, I can't go out as I have many things to do. 总而言之, 我不能出去, 因为我有许多事情要做。 All in all, it has been a great success. 总的来说, 非常成功。 总感觉有那么一点不同....
• 英语翻译Who designed (设计) the first helicopter (直升飞机)?Who __1__ of the most famous pictures in the world?Who knew more about the human body than most __2__?There is an answer __3__ all these questions --- Leonardo de Vinci (达芬奇).Leonardo may have been the greatest genius (天才) __4__ have ever known.He lived in Italy around the year 1500,but many of his inventions seem modern to us today.For example,one of his notebooks has drawings of a helicopter.Of cours
• 英语翻译How do inventions affect people's life?There have been many great inventions,things that changed the way we live.The first great invention was one that is still very important today——the wheel.This made it easier to carry heavy things and to travel long distances.For hundreds of years after that there were few inventions that hadas much effectas the wheel.Then in the early 1800's the world started to changed.There was little unknown and left in th
• How many traelers have been to the Great Wall so far?为什么加been直接写How many traelers have the Great Wall so far?
• 从三个数字123中下选出一个数字两个数字三个数字,分别组成一位数两位数三位数.其中有哪些是质数?
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