The scientists and technicians overcame a lot of difficulty __ the personal computer.A.they have developing B.they had developed答案是A为什么?为什么其他的不能选?

翻译the scientists haven't heard from it yet 英语翻译The most famous,and perhaps the most instructive,failure in predicting the future has occurred in the fields of aero- and astronautics.At the beginning of the twentieth century,scientists were almost unanimous(无异议的) in declaring t Scientists think that the continents___always where they ___today.A.weren't:are B.aren't:are School education is very important and useful.The students not only learn language but also get an education.Yet,n______ can learn everything from school.Great scientists such as Edison,Newton,Galileo and Einstein,didn't learn everything from school Scientists belive there -----(be) more and more people on the earth in the future. According to scientists,before the age of 7,chAccording to scientists,before the age of 7,children don't have a sense of time or place to bring together all the pieces of information that make up a complex (复杂的)and strong memory.是不是定语 英语翻译Muchhas been written about the applicability of systems theory to socialorganizations.The materials available,however,have mainly been written foran audience of behavioral scientists and organization specialists.This isunfortunate,since t Some scientists say that eating the fruit itself won't help against bird flu. the reason that there aren't more women scientists这里是什么从句 Scientists have discovered that sleep and dreams effect the way people feel. Scientists are convinced of the positive effect of laughter on physical and mental health.求翻译. ---,some famous scientists have the qualities of being careful and calessAStrangely enoughBstrange enough French doctors and American scientists have reported doing an operation in which the doctor was out think,animals and plants,every,earth,on,the,die out,year,scientists(连词成句) 英语翻译1.There were 16 votes ( ) my suggestion,and 15 against.2.--------What ( ) inviting Lisa to your party?--------I'm afraid I don't agree.3.He is recognized as one of the greatest scientists ( ) all time. 英语翻译Leading scientists have joined the growing chorus of concern (worry) about governments and companies rushing into producing biofuels (生物燃料) as a solution for global warming,saying that it could be harmful if they do not consider t 关于高中英语one,ones,that,those代词的用法的几道题1.A scientist who speaks and writes English is in closer touch with the scientists in other countries than ______ who doesn’t.A.one B.those Cthe one D.that变题：2.Some scientists wh Scientists study the world and learn about things using a process called 求专业翻译Scientists study the world and learn about things using a process called the scientific method(方法). By asking important questions and 16 the answers, it is