单项选择题

Farmer's program has been criticized by the public because, ________.

A．it causes damage to Net browsers
B．it can break into Internet sites
C．it can be used to cause disorder on all sites
D．it can be used by people with evil intent

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单项选择题

The author's attitude toward SATAN is ________.

A．enthusiastic
B．critical
C．positive
D．indifferent

单项选择题

Which of the following can be a disadvantage of search agents

A．Lack of counseling.
B．Limited number of visits.
C．Lower efficiency.
D．Fewer successful matches.