题目内容：
根据以下材料，回答题Paragraph1
Scientistshavelearnedalotaboutthekindsofpeopleneed.Theysaythatthereareseveralkindsoffoodthatpeopleshouldeateveryday,theyare:(1)greenandyellowvegetablesofallkinds；
(2)citrus(柑橘)fruitsandtomatoes；(3)potatoesandotherfruitsandvegetables；(4)meatofallkinds,fishandeggs；(5)milkandfoodsmadefrommilk；(6)breadorcereal(谷类),riceisalsointhiskindoffood；(7)butter,orsomethinglikebutter.
Paragraph2
Peopleindifferentcountriesanddifferentplacesoftheworldeatdifferentkindsofthings.Foodsarecookedandeateninmanydifferentkindsofways.Peopleindifferentcountrieseat
atdifferenttimesoftheday.Insomeplacespeopleeatonceortwiceaday；Inothercountriespeopleeatthreeorfourtimesaday.Scientistssaythatnoneofthedifferencesisreallyimportant.
Itdoesn'tmatterwheth-erfoodsareeatenraworcooked,canned(罐装的)orfrozen(冷冻的).Itdoesn'tmatterifapersoneatsdinnerat4o'clockintheafternoonorateleveno'clockatnight.Theimportantthingiswhatyoueateveryday.
Paragraph3
Therearetwoproblems,then,infeedingthelargenumberofpeopleontheearth.Thefirstistofindsomewaytofeedtheworld'spopulationsothatnooneishungry.Thesecondisto
makesurethatpeopleeverywherehavetherightkindsoffoodtomakethemgrowtobestrongandhealthy.
Accordingto(依据)thescientists,whichofthefollowinggroupsoffoodisthehealthiestforyourlunch? A．Chicken,apples,cerealandcabbages.
B．Potatoes,carrots,riceandbread.
C．Oranges,bananas,fishandtomatoes.
D．Beef,pork,fishandmilk.
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答案解析：