第30题: [单项选择]When insects feed on decaying plant material in a compost pile, they help turn it into useful garden soil. A. available B. organic C. distasteful D. decomposing 参考答案:D 答案解析:形容词辨析。decaying腐烂的,变质的;available可利用的,可获得的;organic有机的,组织的,器官的:an organic whole有机的整体;distasteful令人厌恶的;无