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

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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

单项选择题

Under what conditions will the formation of cancer begin（）

A．When a chromosome breaks apart neat an oncogene and its control functions fail.
B．When people drink too much and are easy to get tired.
C．When people smoke too much and are difficult to get to sleep.
D．When people eat too much petroleum-based products.