单项选择题

Wrigley made chewing gum popular in the U.S. by ______.

A．putting his ad on every car
B．sending free gum to every person in cities and towns
C．spending all his money on advertising
D．introducing gum to every family by advertising

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单项选择题

Who was the inventor of chewing gum

A．Thomas Adams.
B．William Wrigley.
C．Both Adams and Wrigley.
D．Unknown.

单项选择题

From the passage we can infer that Washington's education was ______.

A．of great variety
B．equal to those of the gentlemen of his time
C．good enough for his time
D．rather limited for a president