Iwouldliketotalktoyouaboutspacevegetables，andtoshowyouthatspacevegetablesarehealthyandgoodforyou．
Spacevegetablesaregrownfromseeds（种子） thathavebeentakentoandbroughtbackfromouterspace．Theseedsareaffectedbyradiationandlowgravityinouterspace．WhentheyarebroughtbacktotheEarth，theseseedsproducevegetablesthatarebigger，healthierandmorenutritious （有营养的）thannormalvegetables．However，somepeopleworryabouteatingspacevegetables．Theythinkthatspacevegetablesmightnotbegoodforusandcouldgiveuscancerasaresultoftheirexposure （暴露）toradiationinspace．Peopleshouldnotbescared，asspacevegetablesareactuallyperfectlyhealthy．
Herearesomefactsthatyoushouldknowaboutspacevegetables：
Spacevegetablesaregrownfromseeds that are carefully selected．Whenseedsarebroughtbackfromspace，peopletesttheseedstomakesurethatthevegetablestheygrowwillbesafetoeat．Therearenotracesofradiationaftertesting．
Spacevegetables are better for you thannormalvegetables．Forexample，spacetomatoesstayfreshfortwentydays，whichisoneweeklongerthannormaltomatoes．Anotherpopularspacevegetableisthepepper（辣椒）．Spacepepperscontain20percentmoreVitaminCthannormalpeppers．
Aftergeneticallymodified（改进的） foodscomeontothemarket，peopleworrythattheyareeatingunknownthings．Forexample，ifnutgenesareputinsidepotatoes，peopleallergic（对…过敏） tonutsmightgetverysickfromeatingthesepotatoesbecausetheydonotknowtheyarealsoeatingnuts．Unlikegeneticallymodifiedfoods，spacevegetableshavenotbeengeneticallychanged．Thismeansthatnonewgenesareputintothevegetables．Therefore，theywon'tdamageyourhealth．
| Beforebeingtakentotheouterspace，theseedsarecarefullyselected． |
| Whenbeingbroughtbackfromspace，seedsare （2）___toseewhethertherearetracesofradiationwhichmight （3）___tocancer．Thetestinghasprovedthattheyareperfectlyhe
刘凯鹏回答：
1．Steps 要点归纳题．此题所在表格后面例出的两个小点都是在介绍关于确保太空蔬菜质量的步骤，所以填step的复数形式表示步骤．2．tested 细节理解题．由"Whenseedsarebroughtbackfromspace，...
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