0025 What purpose does it serve 对话5遍

0025 What purpose does it serve 对话5遍

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 025 Whatpurpose does it serve

Why are you takingvitamin C all day long?

These are reallygood when you’re sick.

What purpose dothey serve?

They helpstrengthen your immune system.

 

what isit used for,他是用做什么的?what is its function



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