关于营养素与胃癌的关系，说法错误的是（）。 A.蛋白质摄入过高或过低均会促进胃癌肿瘤

     How can you make your speech successfully?           
Here is some advices. First, find out as much        
information as possibly about the subject that       
you are going to give it. Second, find out as much   
as you can about the audience who is going to listen 
to you speech. Don't speak something either too     
difficult nor too easy for them. Third, pay attention
to the way by which you are giving your speech. Be   
natural and spoke clearly and slowly so that the     
audience may understand you are saying.              

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