Plants will emit an increased amount of heat when they are ______. The application of infrared scanning technology to agricultu

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问题 Plants will emit an increased amount of heat when they are ______.
The application of infrared scanning technology to agriculture met with some difficulties: ______.

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

答案C

解析 依据文章第三段的第一至二行可以看出红外线扫描技术应用于农业遇到了一些问题,原因有两个:一是农民对新技术的抵制;二是难以找到长期赞助商。文章中最后一段的最后…句提供的信息同样可以反推出10年前的情形。
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