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A．1.4 billion.
B．One fifth of the world’s population.
C．70 percent of the world’s population.
D．50 million.
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单项选择题
A．American heroes in history.B．The importance of American heroes.C．Modern American heroes.D．American heroism.
A．American heroes in history.
B．The importance of American heroes.
C．Modern American heroes.
D．American heroism.
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