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A．Farmer had few tools before the agricultural revolution.
B．People in the United States were traditionally serf-reliant.
C．Life on the farm was extremely difficult.
D．New tools were designed to be portabl
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单项选择题
A．They are constantly troubled by unnecessary worries.B．They are difficult to be pleased by praise.C．They are very sensitive to criticism.D．Others look down upon them as inferior beings.
A．They are constantly troubled by unnecessary worries.
B．They are difficult to be pleased by praise.
C．They are very sensitive to criticism.
D．Others look down upon them as inferior beings.
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