单项选择题

The title of the book was on the ______ of my tongue, but I just could not think of it.

A．end
B．tip
C．back
D．point
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单项选择题
Fred has ______ kind of humour that can only be appreciated by those willing to search beneath the surface.
A．an obvious
B．a hidden
C．a subtle
D．a controlled
单项选择题
The sight of the fruit salad made John's mouth ______.
A．wet
B．ooze
C．water
D．moisten
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