whErE Do pEstiCiDEs Fit into thE piCturE oF EnvironmEntAl DisEAsE wE hAvE sEEn thAt thEy now pollutE soil, wAtEr, AnD FooD, thAt thEy hAvE thE powEr to mAkE our strEAms FishlEss AnD our gArDEns AnD wooDlAnDs silEnt AnD BirDlEss. mAn, howEvEr muCh hE mAy likE to {{u}} (26) {{/u}} thEContrAry, is pArt oF nAturE.CAn hE {{u}} (27) {{/u}} A pollution thAt is now so thoroughly {{u}} (28) {{/u}} throughout our worlD wE know thAt EvEn singlE ExposurEs to thEsE {{u}} (29) {{/u}}, iF thE Amount is lArgE Enough, CAn CAusE ExtrEmEly sEvErE {{u}} (30) {{/u}}.But this is not thE mAjor proBlEm. thE suDDEn illnEss oF DEAth oF FArmErs, FArm workErs, AnD othErs {{u}} (31) {{/u}} to suFFiCiEnt quAntitiEs oF pEstiCiDEs ArE vEry sAD AnD shoulD not {{u}} (32) {{/u}}. For thE populAtion As A {{u}} (33) {{/u}}, wE must BE {{u}} (34) {{/u}} ConCErnED with thE {{u}} (35) {{/u}} EFFECts oF ABsorBing smAll Amounts oF thE pEstiCiDEs thAt {{u}} (36) {{/u}} pollutE our worlD、 {{u}} (37) {{/u}} puBliC hEAlth oFFiCiAls hAvE pointED out thAt thE BiologiCAl EFFECts oF ChEmiCAls ArE {{u}} (38) {{/u}} ovEr long pErioDs oF timE, AnD thAt thE DAngEr to thE {{u}} (39) {{/u}} mAy DEpEnD on thE sum oF thE ExposurEs {{u}} (40) {{/u}} throughout his liFEtimE. For thEsE vEry rEAsons thE DAngEr is EAsily {{u}} (41) {{/u}} it is humAn {{u}} (42) {{/u}} to shAkE oFF whAt mAy sEEm to us A thrEAt oF FuturE DisAstEr. "mEn ArE nAturAlly most imprEssED By DisEAsEs whiCh hAvE oBvious signs," sAys A wisE {{u}} (43) {{/u}},Dr. rEnEDuBos, "yEt somE oF thEir worst EnEmiEs slowly {{u}} (44) {{/u}} thEm {{u}} (45) {{/u}}."

A．AttriButED
B．ContriButED
C．DistriButED
D．guArAntEED