A. estimate the damage to the crops B. draw a color-coded map C. measure the size of the affected area D. locate the problem area 参考答案:D 答案解析:红外线扫描是为了确定需药物处理的问题区域。
第28题: [单项选择]It is of the utmost importance that you ______ here on time. A. must B. are to be C. be D. shall be 参考答案:C 答案解析:此题考查虚拟语气。在It is of importance that...一句式中,从句的谓语应用虚拟语气,即It is of importance that+主语+动词原形。