第17题: [单项选择]The author's purpose in writing this passage is to______. A. explain how Kitty Litter is produced B. describe the Mine Safety and Health Administration C. show how tidy cats are D. show that the government can sometimes be a nuisance 参考答案:D 答案解析:判断题。文章第—句“Sometimes the U．S．government．．．an absolute nuisance．”是个主题句，提出了作者在本文要加以说明的一个主题。
