29．We can use infrared scanning to locate the problem area. / By using infrared scanning to locate the problem area. / By adopting the infrared scanning technology. 　根据第一段A decade ago, adopting the infrared(红外线)scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress.可判断作答。

　　30．Because of renewed concern about pesticides on produce, and refinements in infrared scanning. 　根据第三段But with the renewed concern about pesticides on produce, and refinements(改进) in infrared scanning, Paley hopes to get back into operation.可判断作答。

　　31．Paley may not find the financial backing./Lacking financial backing. / Lacking enough money. 　根据第三段but only if Paley finds the financial backing which he failed to obtain 10 years ago可判断作答。

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