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
Some scientists have suggested that Earth is a kind of zoo or wildlife ______ for intelligent space beings, like the wilderness areas we have set up on earth to allow animals to develop naturally while we observe them.
A．conservation
B．maintenance
C．storage
D．reserve
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