单项选择题

The ______ crown jewels are kept in the Tower of London.

A．valued
B．valueless
C．invaluable
D．usable
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单项选择题
Mr. Brown's numerous New Year's resoluti6ns came to nothing just as the saying goes: A leopard never change its ______.
A．spots
B．dots
C．patches
D．points
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
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