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
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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
单项选择题
When a liquid boils,it becomes a gas.
A．vapor
B．danger
C．fuel
D．bubble
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