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We know that many things were invented    . A.by accident B.for accident  C.with mistake D.in acc...

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grammar  pronunciation  vocabulary  intonation  
the author was a Sunday school boy.  the author used to be puzzled at many things.  the school didn't teach the children enough knowledge.  tape recorders were popular in daily life.  
grammar  pronunciation  vocabulary  intonation  
were coming    are coming    have been coming    had come  
complicated  uncivilized  primitive  well-known  
made of.    made from .   made in.    made into.  
just as old as some well-known languages  just as advanced as some well-known languages  more developed than some well-known language  more complex than some well-known language  
Language is a means of expressing a particular culture.  All languages can well express their respective Cultures.  Some primitive languages can also express their cultures.  Some primitive languages are better than other languages.  
complicated  uncivilized  primitive .  well—known  
grammar.  pronunciation.  vocabulary.  intonation.  
grammar  pronunciation  vocabulary  intonation  
complicated  uncivilized  primitive  well-known  
complicated  uncivilized  primitive  well-known  
language is a means of expressing a particular culture.  All languages can well express their respective cultures.  American Indian languages are as sophisticated as English.  Some languages are better than other languages.  
some backward race doesn’t have a language of its own  some race in history didn’t possess a language of its own  any human race, whether backward or not, has a language  some races on earth can communicate without language  

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