23．We can learn from the passage that __________.

　　A．textbooks are not good for us when 1earning a foreign language

　　B．1earning pronunciation well from the very beginning is very important

　　C．poor pronunciation can be easy to break with the help of native speakers

　　D．seeking too many outside sources will be more harmful than beneficial

　　B

　　Each of us can live strong，healthy，energetic lives for a long time to come．The key？Actually，there are many of them．

　　Eat fewer calories，but more food

　　Slimming down can help prevent disease，and cutting way back on the amount you eat may even slow the aging process．When nutrition researchers invited themselves over for dinner in kitchens across the globe-from Greece to Japan to the state of Pennsylvania--they discovered a stomach-satisfying secret to good health：Pile your plate high with vegetables and fruits，add respectable parts of beans and whole grains，and ignore high-calorie food like cheeseburgers，cream sauces，and fatty meats．

　　Use exercise as an anti-aging vaccine

　　Exercise can help you gain a better quality of life as you age．It's no secret that physical activity strengthens muscles，burn calories，and puts a happy bounce in your step．But recently，researchers discovered a new，extra benefit：Exercise acts as a powerful way against the aging process itself. When exercise physiologists put healthy people aged 60 to 85 on Weight-training programs for six months then tested them for signs of free-radical(自由基) damage，they were surprised by the results．By the end of the study，low-intensity exercisers had a drop in free-radical damage，while high-intensity exercisers had a slight increase．

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