单项选择题

Section B
Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．To test the strength of friendship.
B．To bring friends even closer.
C．To know more people who are in need.
D．To make your friends feel they are helpful.
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单项选择题
A．His poor memory.B．His fatigue.C．His lack of diligence.D．His method.
A．His poor memory.
B．His fatigue.
C．His lack of diligence.
D．His method.
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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