单项选择题

By the time he was ten years old,Beniamin Oliver Davis Jr. had already decided his career would be in the air force.

A．uniform
B．vocation
C．education
D．rank
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单项选择题
Before the invention of photoengraving,steel and copperplate engraving served as the principal means of reproducing illustrations.
A．visions
B．pictures
C．advertisements
D．pages
单项选择题
Although a newspaper's primary function is to inform,special features are usually included for entertainment.
A．jointly
B．cautiously
C．commonly
D．intentionally
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