Whetherornotvegetarianismshouldbeadvocatedforadults,itisdefinitelyunsatisfactoryforgrowingchildren,whoneedmoreproteinthantheycangetfromvegetablesources.Alacto-vegetarian(partmilk,partvegetable)diet,whichincludesmilkandmilkproductssuchascheese,can,however,besatisfactoryaslongasenoughmilkandmilkproductsareconsumed.

Meatandcheesearethebestsourcesofusableanimalproteinandnextcomemilk,fishandeggs.Slowandcarefulcookingofmeatmakesitmoredigestibleandassistsinthebreakingdownoftheproteincontentbythebody.Whencookingvegetables,however,thevitamins,andinparticularthewater-soluble(溶解于水的)VitaminC,shouldnotbelostthroughover-cooking.Withfruit,vitaminlossistoosmalltobeimportant,becausethecookingwaterisnormallyeatenalongwiththefruit,andnaturalchemicalsinthefruithelptoholdinthevitaminC.Mostnutrition(营养)expertstodaywouldrecommendabalanceddietcontainingelementsofallfoods,largelybecauseofourneedforsufficientvitamins.Vitaminswerefirstcalled"addedfoodfactors"whentheywerediscoveredin1906.Mostfoodscontaintheseothersubstancesnecessaryforhealth,inadditiontocarbohydrates(碳水化合物),fats,mineralsandwater.ThemostcommondeficiencyinWesterndietstodayislackofvitamins.Theanswerisvarietyinfood.Awell-balanceddiet,havingsufficientamountsofmilk,fruit,vegetables,eggs,andmeat,fishorchicken(i.e.anygoodproteinsource),usuallyprovidestheminimumdailyrequirementofallthevitamins.

6.Vegetarianismisnotsuitableforgrowingchildrenbecausethey________.

A.needmoreproteinthanvegetablescansupply

B.cannotdigestvegetables

C.usemoreenergythanadults

D.cannoteasilydigestmilkandmilkproducts

7.Alacto-vegetariancaneat_________.

A.cheese,beef,andnuts

B.carrots,milk,andrice

C.potatoes,ham,apples,andbeans

D.tomatoes,bacon,andoranges

8.Slowandcarefulcookingofmeat________.

A.preservesthevitamins

B.breaksdownthevitamins

C.makesiteasiertodigest

D.reducestheproteincontent

9.Thereasonwhythevi