单项选择题
A. Make up homework problems. B. Do research in the library. C. Teach an introductory economics course. D. Grade homework sets.
A. The art of lobbying politicians has a rather long history in U.S. B. Americans have the fights to petition the government. C. Jack Abramoff was charged with corruption. D. The line between lobbying and bribery is vague.
A.has no interest. B.has only one interest. C.has two interests. D.has quite a few interests.