单项选择题

Among the infected patients by SARS, which of the following is most

A．Students.
B．Doctors and nurses.
C．Workers.
D．Officials.
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单项选择题
From the passage, we know ______.
A．Panama was ruled by three countries for 400 years
B．The United States controlled the Panama Canal for 22 years
C．The Panama Canal means a great deal to Panama's economy
D．Panama is the smallest county in Central America
单项选择题
--Do you know who invented ______ telephone--No, But it is really ______ telephone
A．the; the
B．/; the
C．the;/
D．the; a
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