单选题 The Faraday effect was the first demonstration of a connection between magnetism and light.
A. questioning B. proof
C. achievement D. symbol

【正确答案】 B

【答案解析】[解析] demonstration与proof同义，意为“证明，论证”。questioning“问”；achievement“完成，达到，成就，成绩”；symbol“象征，标志”。