填空题

57（）

【参考答案】

D

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单项选择题

The application of infrared scanning technolgy to agriculture met with some difficulties due to （）

A．the lack of official support
B．its high cost
C．its failure to help increase production
D．the lack of financial support

单项选择题

What point is the author making by stating that farmers could carry nearly all their tools on their backs（）

A．Farmers had few tools before the agricultural revolutions.
B．Americans were traditionally self-reliant.
C．life on the farm was extremely difficult.
D．New tools were designed to the portabl