单项选择题

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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单项选择题
A．Exchange some currency.B．Submit a letter of reference recently.C．Not to submit the old letter of reference.D．Make an appointment with the professor.
A．Exchange some currency.
B．Submit a letter of reference recently.
C．Not to submit the old letter of reference.
D．Make an appointment with the professor.
填空题
Different from large organic farms, small organic farms were mainly engaged in ______.
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