单项选择题

A. Billions of customers. B. Millions of customers.
C. Ten millions of customers. D. Ten billions of customers.
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单项选择题
A. People open the container of the milk. B. Special bacteria are added to milk. C. People stir the milk. D. People drink the milk.
A. People open the container of the milk. B. Special bacteria are added to milk.
C. People stir the milk. D. People drink the milk.
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