单项选择题

The fifth generation computers, with artificial intelligence, ______ and perfected now.

A．developed
B．have developed
C．are being developed
D．will have been developed
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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
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
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