2. 外语
  3. The Faraday effect was the first demonstration of a connection between magnetism and light.

The Faraday effect was the first demonstration of a connection between magnetism and light.

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问题 The Faraday effect was the first demonstration of a connection between magnetism and light.
选项 A、questioning
B、proof
C、achievement
D、symbol
答案B
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”。
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