答案：C

题目分析：句意：在南方，树木能够阻止风吹向富饶的农田。prevent sth from doing sth阻止某人或物做某事，固定结构，故选C

点评：prevent sb from doing ,stop sb from doing sth, keep sb from doing sth, protect sb from doing sth 都有阻止某人做某事的意思，此类重点的短语，学生平时要加强记忆，加强知识点的背诵。