20.A.but B.while
C.and D.otherwise
A [not...but...是固定搭配,意为“不是……而是”,符合语境。故选A。]
Ⅳ.阅读理解
(2016·河北石家庄五校联考)Each of us can live strong,healthy,energetic lives for a long time.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 stomachsatisfying secret to good health:Pile your plate high with vegetables and fruits,add respectable parts of beans and whole grains,and ignore highcalorie food like cheeseburgers,cream sauces,and fatty meats.
Use exercise as an antiaging vaccine
Exercise can help you gain a better quality of life as your age.It’s no secret that physical activity strengthens muscles,burns 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 weighttraining programs for six months then tested them for signs of freeradical (自由基) damage,they were surprised by the results.By the end of the study,lowintensity exercisers had a drop in freeradical damage,while highintensity exercisers had a slight increase.
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