题目

I love this healthy diet program because, it helps you lose weight, lose inches, feel healthy and look beautiful. This healthy diet is an 8 week's program which is unlike other diet regimes （食物疗法）. In that it focuses on proper nutrition first and weight loss second. Your body must have proper levels of minerals, vitamin, and protein in order to work well. It provides a simple lifestyle change to give you more energy and improve your health most greatly. It offers control over stomach and continuing hunger with a dense diet allowing 1,700 to 2,000 calories a day. If a person has a 格里菲思（F．Griffith）用肺炎双球菌在小鼠身上进行了著名的转化实验，此实验结果 A．证明了DNA是遗传物质             B．证明了RNA是遗传物质 C．证明了蛋白质是遗传物质            D．没有具体证明哪一种物质是遗传物质