四级标准听力测试模拟一Section B答案解析(3)

　　Passage Three

　　Diet, diet, diet! It gets to be a constant battle for many of us to stay fit and healthy. But diets don’t always allow us to learn new eating habits, improve our self-image, or make lifestyle changes. Developing good eating habits and proper exercise is a permanent issue. And it’s the main topic of this workshop.

　　In order to keep a healthy diet and minimize the risk of disease, it’s essential to eat a diet that consists of low fat foods and to maximize energy with carbohydrates. Beef, nuts, oils, and most dairy products are rich in fat, so you should eat less of those; while pastry, rice, potatoes, and bread contain almost no fat and are a high energy source of complex carbohydrates. You know that many food manufactures use sugar to make low fat or fat free foods taste good, but don’t worry too much about that. You don’t necessarily “get fat” by eating sugar, since sugar is an indirect fat.

　　When you exercise, carbohydrates are the first calories to burn, if you want to burn off fat, it’s good to do some sort of aerobic exercise such as biking, swimming, running, or fast walking. But you have to keep doing this exercise for at least twenty minutes because it takes about that long before we start to burn fat. And then the effect of burning fat decreases after forty-five minutes of exercise. So if you do some sort of aerobic exercise for three to four days a week for about thirty to forty minutes, you’ll have an affective schedule for reducing weight.

　　Questions 32 to 35 are based on the passage you have just heard.

　　32. What is the main topic of this talk?

　　【解析】选[D]。在听录音之前，预览选项可知本文与饮食习惯和锻炼有关。

　　33. According to the speaker, which will burn most quickly with exercise?

　　【解析】选[B]。预读选项可知此题询问有关食物种类的细节，听的过程中需要留意对它们的描述。本题答案依据为When you exercise, cabohydrates are the first calories to burn, 根据常识sugar正是碳水化合物的一种，故选[B]。

　　34. According to the speaker, what is the most effective exercise time schedule for reducing weight?

　　【解析】选[D]。预读选项可知此题询问的有关锻炼的时间安排。注意，只要抓住three to four days a week这个关键信息就可以了。

　　35. What does the speaker say is burned at the beginning of exercise?

　　【解析】选[A]。预读选项可知此题询问的有关食物营养成分的细节。注意，Carbohydrates的意思是“碳水化合物”。

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