单项选择题


Questions 22 to 25 are based on the conversation you have just heard.

A．His poor memory.
B．His fatigue.
C．His lack of diligence.
D．His method.
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单项选择题
When computer viruses reach the cockroach stage of machine intelligence, the viruses ______.
A．become diversified
B．become infectious
C．are easily destroyed
D．are difficult to kill
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