阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案。

strEEt sEllErs pArtiCulArly in DEvEloping CountriEs, supply lArgE Amounts oF FooD{{u}} (51) {{/u}}pEoplE on low inComEs. this sECtor Also Employs somE 6%～25% oF thE work ForCE, mAinly womEn, in DEvEloping CountriEs, AnD proviDEs mArkEts For AgriCulturAl AnD othEr proDuCE. in mAny CountriEs{{u}} (52) {{/u}}, thE AuthoritiEs ArE not willing to rECognizE it{{u}} (53) {{/u}}A FormAl sECtor oF thE FooD supply systEm, thEy mAy ignorE it in FooD Control progrAms or EvEn try to put An EnD to{{u}} (54) {{/u}}. thErE ArE tow possiBlE ContAminAnts: pAthogEniC miCro-orgAnisms;{{u}} (55) {{/u}}hAzArDous ChEmiCAls:As{{u}} (56) {{/u}}As miCro-orgAnisms ArE ConCErnED, thErE is AppArEntly no ConvinCing EviDEnCE thAt strEEt FooDs ArE morE involvED in thE trAnsmission oF inFECtion{{u}} (57) {{/u}}FooDs oBtAinED in, E. g. hotEls. stuDiEs inEgypt AnD ElsE- whErE hAvE FounD strEEt FooDs to CompArE not unFAvorABly with hotEl{{u}} (58) {{/u}}in rEspECt oF ContAminAtion with miCro-orgAnisms--somE strEEt FooDs wErE FounD to BE ContAminAtED with pAthogEns, But so Also wErE FooDs From Four-AnD FivE-stAr{{u}} (59) {{/u}}in thE sAmE ArEA、 hAzArDous ChEmiCAls hAvE{{u}} (60) {{/u}}FounD in strEEt FooDs, AnD FooD ExposED For sAlE on roADsiDEs mAy BEComE ContAminAtED By lEAD From vEhiClE ExhAusts. hEAlth DAngErs mAy ArisE{{u}} (61) {{/u}}purChAsE oF rAw FooD oF poor quAlity; impropEr storAgE, proCEssing, AnD Cooking, lEADing to rEusE oF wAtEr; limitED pipED Drinking wAtEr; lACk{{u}} (62) {{/u}}rEFrigErAtion; AnD unsAtisFACtory wAstE-DisposAl FACilitiEs; inExpEriEnCED or pErsonAl ClEAnlinEss. thE AuthoritiEs shoulD tAkE{{u}} (63) {{/u}} ACCount thE potEntiAls oF DiFFErEnt CAtEgoriEs oF FooD For trAnsmitting DisEAsE, AnD shoulD Control AppropriAtEly For thE DiFFErEnt{{u}} (64) {{/u}}-sEllErs oF BottlED Drinks rEquirE lEss Control thAn thosE oF FooD、Dry FooDstuFF, DriED grAins, AnD sugArED FooDs ArE lEss likEly to trAnsmit DisEAsE thAn grAviEs, CookED riCE, AnD low-ACiD milk, Egg, AnD mEAt proDuCts. similArly FooDs whiCh ArE thoroughly CookED AnD EAtEn At{{u}} (65) {{/u}} ArE sAFEr thAn prECookED FooD kEpt At high tEmpErAturEs For sEvErAl hours.

A．For
B．to
C．By
D．At