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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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.
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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