It can be inferred from the passage that in early AmericaA．people competed with each other
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It can be inferred from the passage that in early America
A．people competed with each other fiercely for land.
B．many people worked for the railroad companies.
C．quite a few families made it on their own.
D．social and personal interdependence was indispensable to Americans.
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正确答案：D
解析：推断题。根据文章第三段第一、二句话“...few families in Americans history...have been able to rely solely on their own resources．Instead，they have depended on the legislative，judicial and social support structures set up by governing authorities”，第四段第一句说明在美国初期，政府扶植“was...the norm”，最后一句话认为自力更生的想法"was not only ridiculous...but also dangerously parochial”，可以看出政府的扶持在殖民时期、大革命时期是很普遍的、必要的。