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
What does the professor mean by saying something like that at the end
A．The answer is close but not exactly correct.
B．The answer is totally out of target.
C．The answer is really correct.
D．The answer is too obvious.
单项选择题
What can we infer from this conversation
A．The new record of 400 meter in the NCAA Indoor Track and Field Championships is 44.63 seconds.
B．Kerron Clement broke the world record in the 400 meter when he was 19.
C．The student says he can win Kerron Clement if he is given ＄ 20.
D．Kerron Clement wants to become American because he doesn’t like his hometown.
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