单选题
He knew that the area"s rich plant life had been severely ______ by the huge herds of cows grazing the land.
【正确答案】
A
【答案解析】[解析] A项，“depleted”意为“耗尽……的资源，使枯竭”；B项，“decomposed”意为“分解，使腐烂、使腐败”；C项，“corrupted”意为“腐蚀，使堕落”；D项，“corroded”意为“腐蚀，侵蚀”，句意说的是植被资源因放牧被耗尽了，因此选择A。