最后一分钟的 作文:1.why is chemical digestion of food necessary?

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2.in some people the duodenum becomes ulcerated( the wall is eaten away!) what might cause this?
1.why is chemical digestion of food necessary? why apple is red Is Hamlet crazy? Why? Is Hamlet hesitant? Why? beckham why is beckham?? why sea is blue Which is right?Why? Why is documentary important? why is biodiversity important Why is honesty important?