单选题 What's the writer's purpose in giving an example of the man?
【正确答案】 C
【答案解析】本题为事实推测题.作者在第二段开头指出"Scientists think that people make deserts. 然后概括指出 "People are doing bad things to the earth'而在文章的第三和第四两段通过具体事例来证明自己和看法。