Scientists have learnt a lot _________the kinds of food people need.A.ofB.fromC.aboutD.at顺便帮我讲一下哈

LEAR Scientists have given many ideas for ______space. I have to lear to make sick people better.就划线部分提问划线部分是to make sick people better答案给的是why do you have to lear 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 Scientists have much knowledge about trees.同意句 英语阅读理解一篇 请详解1.Japanese youth's interest in science is dropping probably because _ .A.scientists don't make much money in JapanB.' there are too many scientists in Japan alreadyC.science is more difficult for young people to lear 关于Amanda Lear的身世? lear the fastest.的意思 Many scientists have created a new t____ to diagMany scientists have created a new t____ to diagnose and treat children born with heart disease. 口译听力问题1Scientists have yet to develop battery-operated cars.何意? Scientists have learnt a grate deal about the kinds of food people need. Until recently scientists would have disapproved of such an idea.啥意思?