回复：漏洞百出

1 豆腐发明年代错误; Tofu was invented in South Song, which was documented in literature. Why is this an error? Where do you have the right record?

2 中国人外国人都是28颗牙加上四颗智齿; Chinese adults mostly have 28 teeth, four to 6 less than those in the nations who do not consume tofu.  

3 日本也用石膏做豆腐，常常是石膏+盐卤. Japanese used to making tofu with gypsum, but since 70's they stop this techneque they learned from China. Instead, Japanese have used other gradients to make tofu.

4 豆腐中的钙不能被人体吸收缺乏科学文献支持和试验证明. Tell me where is edivence that gypsium in tofu can be absorbed by human systems. The fact is that consumption of gypsum-bearing tofu causes loose of calcium from human systems thus results in the lack of calcium.

你的英文错误也有很多错，还是写中文吧; My English is adequate for communication and typing English is much fast than Chinese.