单项选择题

The tone of the text can best described as______.

A．optimistic and humorous
B．analytical but concerned
C．passionate but pessimistic
D．scholarly and cautious
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Which of the following best defines the word doctored (Para. 1, Line 10)
A．Falsified.
B．Cured.
C．Deceived.
D．Diagnosed.
单项选择题
Compared with SoBig. F, Blaster was a virus that was______.
A．more destructive
B．more humorous
C．less vulnerable
D．less noticeable
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