单选题   Officials from the Department of Agriculture confirmed that the ______ floods and drought this summer did not affect the country's grain output.
 
【正确答案】 D
【答案解析】 题干译文：农业部的官员证实今夏的水灾和旱灾不会影响农产品产量。空白处修饰水灾和旱灾，因而答案是D，含义是“破坏性的”。选项A为“涟漪”；选项B为“衰退，退潮”；选项C为“波动的”。