单项选择题

What does the passage mainly tell us

A．Invention of chewing gum.
B．Chewing gum's contribution to people's health.
C．How Wrigley made chewing gum popular in the U.S.
D．Chewing gum--a great favorite with the American peopl

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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