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
单项选择题
When a person dies, his debts must be paid before his ______ can be distributed.
A．paradoxes
B．legacies
C．platitudes
D．analogies
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