题目

阅读理解 Steven Stein likes to follow garbage trucks. His strange habitmakes sense when you consider that he's an environmental scientist who studies howto reduce litter, including things that fall off garbage trucks as they drive downthe road. What is even more interesting is that one of Stein's jobs is defendingan industry behind the plastic shopping bags. Americans use more than 100 billion thin film plastic bags everyyear. So many end up in tree branches or along highways that a growing number ofcities do not allow them at checkouts(收银台) . The bags are prohibited in some 90 citie