有两项为多余选项。可知控制体重是长期的成功，故选B项

【题目】根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。有两项为多余选项。Weight loss is a hard topic. Lots of people aren’t satisfied with their present weight，but most people aren’t sure how to change it. You may want to look like the models or actors in magazines or on TV，but those goals might not be healthy or realistic for you.  【1】 So what should you do about your weight control?【2】The best way to find out if you are at a healthy weight or if you need to lose or gain weight is to talk to a doctor or a dietitian(营养学家).  【3】If it turns out that you can benefit from weight loss , then you can follow a few of the simple suggestions listed below to get started.【4】 People who lose weight quickly by crash dieting or other extreme measures usually gain back all of the pounds they lost，because they haven’t permanently(永久地) changed their habits. Therefore，the best weight management ways are those that you can maintain(保持)for a lifetime.Small changes are a lot easier to stick with(坚持) than large ones. Try reducing the size of what you eat.  【5】 Once you have that done，start gradually introducing healthier foods and exercise into your life.It’s a good idea to maintain a healthy weight because it’s just that：healthy.