单选题 Professor Smith' s new invention has created a great ______ on the campus.
A. sensation B. selection C. imitation D. irrigation

【正确答案】 A
【答案解析】句意：史密斯教授的新发明在校园里引起了极大的轰动。sensation知觉，轰动。selection选择，挑选。imitation模仿。imitation灌溉，冲洗。