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

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

admin2011-05-29  37
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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