A
There have always been a lot of commonly believed but false ideas about being fat and doing exercise.Some people believe that they can't help putting on weight as they get older，while others hold that if they stop exercising，their muscles will turn into fat.Here are some more myths：
I'll never lose weight—I come from a fat family
Wrong! While we can't change the body type we are born with，we can't blame our genes for making us fat.There's plenty of evidence that fatness runs in families，and the main reason is that they share the same habits of eating too much and exercising too little.
I am fat because I burn calories slowly
Wrong! Fatness is not caused by a slow metabolism (新陈代谢)．In fact，although fat people consume more energy than slim people，they also fail to realize how much they eat! Keeping a diary can help you work out your daily food intake more accurately.
Exercise is boring
Wrong! Anything will become boring if you do it repetitively.The key is to develop a balanced and varied program that's fun as well as progressive.If you enjoy a Sunday walk，take a different route.If you do yoga，try a tai chi class.If you like swimming，set yourself a distance or time challenge.
No pains，no gains
Wrong! Exercise is not meant to hurt.Indeed，pain is your body telling you something's wrong ，and continuing to exercise could lead to serious injury.You may experience mild discomfort as you begin to exercise regularly，but this is your body adapting to the positive changes in your lifestyle and the aches should disappear relatively quickly.If they don't，rest and seek medical advice.
【解题导语】 关于肥胖和锻炼，人们一直有一些错误观点。作者就四种常见的错误说法进行了分析和解释，澄清了事实真相，为人们减肥和锻炼指明了方向。
21．What does the author think about being fat?
A．It is the family genes that make people fat.
B．People are fat because they consume too little energy.
C．A diary of exercise can prevent people from becoming fat.
D．It is the consequence of people's unbalanced lifestyle.
解析：选D 推理判断题。根据第二段最后一句和第三段最后一句可推断出，作者认为肥胖的原因在于人们不均衡、不健康的生活方式。
22．What is the author's opinion about pain in exercising?
A．Keeping fit is essentially a painful experience.
B．Exercise should be stopped if continuous pain is felt.
C．Pain in exercise is a precondition for reaching your goal.
D．Getting used to pain leads to positive changes in your body.
解析：选B 推理判断题。根据最后一段可推断出，在锻炼过程中如果感觉持续疼痛应该停止锻炼，休息一会儿然后去看医生。
23．What is the purpose of the passage?
A．To declare the importance of keeping fit.
B．To clarify some misconceptions about fatness and exercise.
C．To confirm what has long been believed about keeping fit.
D．To explain some medical facts about being fat and doing exercise.
解析：选B 写作意图题。通读全文内容可知，文章的主要目的是纠正一些关于肥胖和锻炼的错误观点，澄清一些事实。
