单项选择题

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

A．watermelon
B．watershed
C．waterproof
D．watermark
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单项选择题
Three dinosaurs have already been found on the ______ site.
A．evacuated
B．excavated
C．exhaled
D．exhorted
单项选择题
The rebel army is attempting to ______ the government.
A．christen
B．subvert
C．concoct
D．harrow
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