声音简介
P4:
A farm is a place where people produce things. Some of the things are sold. Some are used there on the farm. There are many kinds of farms. Some kinds, like dairy farms, have animals. On other types of farms fruits and vegetables are grown.
P5:
A farmer has cows on a dairy farm. Twice a day, the farmer milks the cows. Then the farmer can sell the milk.
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