单项选择题

In statistics, the mathematical mean is obtained by dividing the sum of a group of scores by the number of scores.

A．total
B．square
C．numerator
D．list
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单项选择题
The Texas Opera Theater was established as a subsidiary of the Houston Grand Opera in order to give young singers performing their their experience.
A．hall
B．rival
C．patron
D．branch
单项选择题
At age twenty-five Orson Welles stunned the film world with his movie Citizen Kane.
A．amused
B．amazed
C．frightened
D．offended
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