单项选择题

Melissa is a computer______that destroyed files in computers and frustrated thousands of users around the world.

A．genius
B．virus
C．disease
D．bacteria
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单项选择题
People innately______for superiority over their peers although it sometimes takes the form of an exaggerated lust for power.
A．strive
B．ascertain
C．justify
D．adhere
单项选择题
Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien.
A．insane
B．infectious
C．foreign
D．poisonous
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