单项选择题

A．Doing business.
B．Taking pictures.
C．Buying cameras.
D．Making movies.
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单项选择题
A．The United States.B．Canada.C．No country.D．Both the United States and Britain.
A．The United States.
B．Canada.
C．No country.
D．Both the United States and Britain.
单项选择题
The word innovations in the second paragraph means _________.
A．new theory
B．new phenomenon
C．changes
D．new inventions
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