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一、语法填空
阅读下面短文，根据上下文及中文提示填入适当的词语，或使用括号中所给词正确形式填空。
The human body has developed its millions of nerves to be highly aware of what goes on both inside and outside of it.This helps us adjust to the outside world.Without our nerves and our brain, 1 is a system of nerves,we couldn,t know what is happening.
阅读下面短文，根据上下文及中文提示填入适当的词语，或使用括号中所给词正确形式填空。
The human body has developed its millions of nerves to be highly aware of what goes on both inside and outside of it.This helps us adjust to the outside world.Without our nerves and our brain, 1 is a system of nerves,we couldn,t know what is happening.
