.（2010·山东淄博高三第一次摸底考试）32. They will show ten topics — from using clean energy _________ the environment — and give you a chance to make your own choice. A. to protect
It was_________great shock to the world that two aero-planes crashed into______World Trade Center in New York o September 11th, 2001. A. a; / B. a; the C. the; the D. /;
