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補(bǔ)全短文

Helping the planet is a big part of what our world trip is all about and that‘s exactly what we did this past week. We helped get a hydroponics farm started in a local village. This farm will be a model for the local villagers so they can start their very own self sustaining farm. Hydroponics is a type of farming that uses a third of the water needed in an average farm and uses no soil.

A hydroponics farm _______________.

A.is difficult to build

B.is a type of farm without soil

C.will cost lots of money

D.was started in the village before they came

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