单项选择题

A. Latin America.
B. North America.
C. South America.
D. Central America.
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单项选择题
A. 13 million. B. 30 million. C. 14 million. D. 40 million.
A. 13 million.
B. 30 million.
C. 14 million.
D. 40 million.
单项选择题
A. Experimental medicines. B. Special treatment centers. C. Flexible work schedule. D. Innovative physical exercises.
A. Experimental medicines. B. Special treatment centers.
C. Flexible work schedule. D. Innovative physical exercises.
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