单项选择题
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.
A. By using satellite images, maps, etc. B. By studying specific farming methods. C. By studying the variation of human population. D. By analyzing the quality of crops.