阅读理解。 Like most people, you've probably never given your blood glucose (糖) a second thought, unless you have diabetes (糖尿病). But researchers now know that whether or not you have diabetes, eating too much can make your blood glucose go up and down and can increase the danger of heart disease. It may be even bad for your memory. This realization has greatly changed the way we understand food and health. Luckily, none of these things happen ovemight, and even small changes in the food you eat every day can start you on a healthier path. When you are hungry, do you reach for a chocolate cake or a box of biscuits? These 'fast-acting' foods are handy and they take no time at all to dissolve (溶化) in your stomach. Then they race into your blood, running through your body with blood glucose. The trouble is the comfort doesn't last long, leaving you feeling hungry again. As a result, your blood glucose will run out of control. It's no wonder most of us have less energy than we'd like and feel tired too often. It's also no wonder that most of us weigh more than we want to. Yes, eating too much and exercising too liLtle are main reasons, and ever changing blood glucose will send you shopping for bigger jeans. For most of us even when our blood glucose goes up and down after a large meal, our body can bring it back to normal in a few hours. Only people with untreated diabetes have blood glucose levels that stay quite high most of the time. For a long time, doctors thought that only these people needed to take care of their blood glucose levels. Now, we know that even in healthy people, high levels after meals can damage (损坏) the body, even if it never causes diabetes. 1. How does our blood glucose change after a large meal? A. It remains unchanged. B. It stays on high levels. C. It goes up and down. D. It comes back to normal. 2. What does the writer think of 'fast-acting' foods? A. He thinks they are delicious. B. He thinks they are easy to get. C. He thinks they make us healthy. D. He thinks they damage our body. 3. What shall we do if we want to keep the normal blood glucose? A. Check our blood glucose after each meal. B. Have proper food and exercise every day. C. Eat certain kind of medicine before meals. D. Ask the doctor for help from time to time.