The ______ on a bank note is virtually invisible on a flat surface.

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问题 The ______ on a bank note is virtually invisible on a flat surface.

选项 A、watermelon
B、watershed
C、waterproof
D、watermark

答案D

解析 watermelon西瓜；watershed分水岭；waterproof雨衣；watermark水印。根据句子的含义，只能选watermark．

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考博英语

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