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A．Because it was difficult to collect.B．Because it was difficult to get rid of.C．Because it came in a variety of forms.D．Because it tended to be absorbed by physical objects.
A．Because it was difficult to collect.
B．Because it was difficult to get rid of.
C．Because it came in a variety of forms.
D．Because it tended to be absorbed by physical objects.
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Different from large organic farms, small organic farms were mainly engaged in ______.
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