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首先，请阅读下列的应用文：
A．Chapter 1：…you probably have an image in your mind of what the"perfect'or"ideal"body looks like．Try not to press yourself to look that way．Each person is born with genes that control the shape of his/her body．Everyone is different．It's important to be comfortable with the body you have．
B．Chapter 2：…You use energy for everything you do．That energy comes from the food you eat．Too much food or too little regular exercise causes your body to store the extra energy in fat cells．But，if you exercise regularly and eat a healthy diet，you'll feel healthier and stronger not to mention look great．
C．Chapter 3：…Your body runs best on foods high in carbohydrates and low in fat and sugar．Eating a healthy diet will provide your body with everything it needs to run smoothly．Your body breaks down proteins into amino acids（氨基酸），so you don't need to take in the amino acids separately．
D．Chapter 4：…Exercise does more than just burn calories．For instance，regular exercise makes your muscles strong and flexible，and increases the amount of muscle you have．It also makes your heart stronger and lowers your blood pressure； …
E．Chapter 5：…Always warm up and stretch for 5-10minutes before you do strength or endurance exercises．Afterwards，take 10minutes to cool down．Your heart should beat normally when you stop．Exercising with a group may help you to exercise regularly．
F．Chapter 6：…Supplementation of a mixture of essential amino acids will increase protein synthesis （蛋白质综合体）．While supplementing with either carbohydrate or amino acids may limit muscle damage and stimulate （激励） protein synthesis，there is increasing evidence that the combination can have an addictive effect．
以下是与上述章节的信息相关匹配的读者，请匹配读者和他/她需要了解的相关信息的所在章节．
 | 66．David：He always breathes heavily and his heart beats irregularly when he finishes his exercise．He wonders whether there is something wrong with his body or whether he is not suited for physical exercises． |
 | 67．Ruth：She likes eating meat and a lot of sugar every day as she thinks that they can provide people with energy．Besides，she does sports on weekends．However，she is not energetic enough to face the pressure．She needs a healthy diet． |
 | 68．Rose：She is fond of many types of food but too busy to take up regular exercise．She doesn't look well，and she blames her unshapely figure on the stress from her work． |
 | 69．Tom：He is a Grade One college student majoring in gymnastics．He must write a passage about what a healthy and perfect body is according to the science of genes． |
 | 70．William：He is a coach，working in a gym．He will start a new course next month on how to lose weight and make the heart stronger．For the first few lessons，he is going to talk about why people have to exercise． |