When you exercise, carbohydrates are the first calories to burn, if you want to burn off fat, its 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, youll 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。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。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。
34. According to the speaker, what is the most effective exercise time schedule for reducing weight?
【解析】选。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。
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