第19题: [单项选择]Few people realize how rich that area is. It is a land of treasure______ treasure. A. increased by B. derived from C. turned over D. piled on 参考答案:D 答案解析:词组和固定搭配。increase by指“增长”;derive from指“由来、衍生”;turn over指“打翻、周转”;pile on指“堆积”。因此,只有D符合句意。