单项选择题

A. Experimental medicines. B. Special treatment centers.
C. Flexible work schedule. D. Innovative physical exercises.
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单项选择题
A. When he is pleased. B. When he grows up. C. When he gets angry. D. When he hears other baby crying.
A. When he is pleased. B. When he grows up.
C. When he gets angry. D. When he hears other baby crying.
单项选择题
A. 800 years. B. 400 years. C. 550 years. D. 2,000 years.
A. 800 years. B. 400 years. C. 550 years. D. 2,000 years.
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