填空题 A. stronger
B. your skin
C. any harm
D. diet
E. your knees and hips
F. appearance
G. your back

填空题 Running on soft ground protects ______.

填空题 Going to bed late does harm to ______.

填空题 You look heavier than you are if you don't straighten up ______.

填空题 Eating chocolate in moderation won't do you ______.

填空题 Getting regular exercise is the best way to protect your ______.