神农____tea when he was boiling drinking water over an open fi

C
try out 试验 They are trying out the new method.
他们正在试验那种新方法.
find out 找出;发现;查明 Please find out when the train starts.
请查一下火车什么时候开.
discover 发现,发觉;找到 Who first discovered America?
谁最早发现美洲大陆?
The lost bike was discovered at the bus stop.
丢了的自行车在公共汽车站那儿找到了.
invent 发明,创造,捏造,虚构
He invented a new type of stethoscope.
他发明了一种新型听诊器.
We must invent an excuse for being late.
我们必须编一个迟到的借口.

c
书上有相同例句。。。