单项选择题

When did chewing gum become popular in the United States

A．In 1890.
B．In 1819.
C．In 1870.
D．In 1817.
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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
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.
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