单项选择题

With all its advantages, the artificial intelligence is by no means without its ______.

A．boundaries
B．restraints
C．confinements
D．limitations
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单项选择题
For some serious coin collectors, a coin with a different date, mintmark, and even a little ______ in design is counted as a different coin.
A．contrast
B．diversity
C．variation
D．variety
单项选择题
He might have lost his daughter ______ the timely arrival of the policemen.
A．but for
B．except for
C．besides
D．except
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