听力原文：I am writing to thank you for the interesting reports which appeared in the July

听力原文： I am writing to thank you for the interesting reports which appeared in the July '94 edition of Saturday Evening Post. I am interested in your reports since B12 deficiency is an inherited disorder in my family. In the late 1950s and early 1960s, a research project was carried out on it by London medical school.

My grandmother was 49 when she started vitamin t312 injections in 1949, She was admitted to the hospital with a blood disease. My mother was 63 when she began vitamin B12 injections. After reading your article, I believe her treatment was started too late. At the time, she almost lost her eyesight and was told that she had another diseases.

Earlier this year, I visited my doctor and explained that 1 felt very tired and asked for a blood test to establish whether I was suffering from B12 deficiency. I was told I was much too young and that only people in their 80s suffered B12 deficiency. I told him he was wrong and that research was carried out on my family 30 years ago.

I have always believed that prevention is better than cure. I now know why I love Kellogg's Honey Nut Cornflakes. They contain vitamins, including B12! If foods contain added vitamins, as

you suggest in your article, then B12 deficiency and diseases associated with it should be left to the past.

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A．It is a thank-you letter to a medical doctor.

B．It is an advertisement for vitamin B12.

C．It is a letter to the editor of a magazine.

D．It is a preface to a book on vitamins.