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补全对话,每空一词.a:What is that It looks strange.b:It's ____ old ma

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补全对话,每空一词.
a:What is that It looks strange.
b:It's ____ old machine.
a:What was it used for?
b:It was used by people for ___ water ___ a river or a lake.
a:How ____ it work?
b:Usually two people stood ____ it.They pushed the pedals down hard with their ____.
Then ____ could be brought up.
a:What was it made ___?
b:It was made of ____ .It can be hardly seen in China now.
(这倒底是个什么东东啊?)
(这倒底是个什么东东啊?)
it's (an) old machine
it was used by people for (bringing) water (from) a river or a lake
how DOES it work?
usually two people stood (on) it,they pushed the pedals down hard with their (feet).
then (water) could be brought up.
what was it made (of)
it was made of (wood).it can be hardly seen in China now.
PS:how does it work.意思是它怎样工作.how did it work,意识是它工作的怎么样.
脚踏式水车.