单项选择题

The three republican presidents contributed to the boom of US economy in the 1920's because __________.

A．they advocated welfare state
B．they advocated government's regulating business
C．they introduced lower taxes and raised tariffs on foreign good
D．they encouraged competition between American businesses and overseas businesses
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单项选择题
Which of the following statements is NOT TRUE about the United States in the 20's
A．This time period is called "the Age of Excess" by writer F. Scott Fitzgerald.
B．President Harding of this time period supported "protectionism".
C．During this period, the US manufacturing output was on a continuous increase without suffering any setbacks.
D．Jazz music became very popular among the young in the US during this period.
单项选择题
The author thinks it not proper to make a phone call while driving because of the following reasons EXCEPT_________.
A．there are some people who are not good at driving
B．there are some people who are not good at using cell phones
C．it is insane to do so
D．it is not allowed by the federal law
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