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
The ______ emphasis on examinations is by far the worst form of competition in schools.
A．negligent
B．edible
C．fabulous
D．disproportionate
单项选择题
During his two-month stay in China, Tom never ______ a chance to practice his Chinese.
A．passed on
B．passed up
C．passed by
D．passed out
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