Scientists have ____ that motion is the source of lifea、shownb、showedc、been shownd、showing

Scientists have ____ that motion is the source of lifea、shownb、showedc、been shownd、showing Scientists have many theorise about how the universe ____ into being Many scientists have ____(aready,yet)been to the North Pole.填什么 一些科学家已经使机器人行走和跳舞了.Some scientists have already ____ robots _____and_____. Scientists have established a (connect) ____ between smoking and lung cancer. Scientists have given many ideas for ______space. ____ scientists have done a lot of researth on the (H1H1) flu,there are some class for further.A.As B.Once C.If D.Although ____,some famous scientists have the qualities of being both careful and careless.答案是strangely enough为什么不是strnge enough 高一英语(Unit 1):同义句转换：Scientists have made great progress in the research on同义句转换:Scientists have made great progress in the research on the medicine but there is still a long way to go.The medicine ____ ____ greatly ____ b With the population explosion,scientists will have to ____ new.11.With the population explosion,scientists will have to ____ new methods of increasing the world’s food supply.A.lead to B.carry out C.come up with D.stick to 12.The police are _____ t ____ scientists have done a lot of research on A1H1N1 flu,there are still some cases for further st____ scientists have done a lot of research on A1H1N1 flu,there are still some cases for further study.A.AsB.OnceC.IfD.Although 求翻译：Japanese scientists have created a power Scientists have lots of idea 要成单数的哦, Scientists have d_____ that this disease is carried by mice. Scientists have already made robots to walk and dance 改错 Scientists have already made robts walk and dance.否定句 scientists have a____found ways to ……首字母 British scientists have a 20-year study.汉语意思是什么