根据材料请回答 46～50 What Is Type 1 Diabetes? When you eat, your body takes the sugar from food and turns it into fuel. 46 .Your body uses glucose (葡萄糖) for energy, so it can do everything from breathing air to playing a video game.But glucose cannot be used by the body on its own - it needs a hor- mone called insulin to bring it into the cells of the body. Most people get the insulin they need from the pancreas, a large organ near the stom- ach.The pancreas makes insulin; insulin brings glucose into the cells; and the body gets the energy it needs.When a person has Type 1 diabetes, it is hecause the pancreas is not making insulin.So someone could be eating lots of food and getting all the glucose he needs, but without insulin, there .is no way for the body to use the glucose for energy. 47 . You may have heard older people talk about having diabetes, maybe people of your grandparents' age.Usually, this is a different kind of diabetes called type 2 diabetes, or a- dult-onset diabetes.48 . When a kid is diagnosed with juvenile ( Type 1 ) diabetes, he will have that type of diabetes for his whole life.It won' t ever change to Type 2 diabetes when he gets older. Scientists now think that a person who has juvenile diabetes was born with a certain gene or genes that made the person more likely to get the illness. 49 .Many scientists be- lieve that along with having certain genes, something else outside the person's body, like a viral infection, is necessary to set the diabetes in motion by affecting the cells in the pan- creas that make insulin. But the person must have the gene (or genes) for diabetes to start out with this means you cannot get diabetes just from catching a flu, virus, or cold.And this type of diabetes isn't caused by eating too many sugary foods, either.Diabetes can take a long time to de- velop in a person's body sometimes months or years.Another important thing to remem- ber is that diabetes is not contagious. 50 .
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B 正确是B。文章的第一句讲，一个人进食后，身体便会从食物中获取糖并将其转化成养料。而后一句中提到一个新概念“g......